They are In fact prudentially also,their GDP share is as good as a rare gem (Take the GDP of HC verma book and add the amount of people it educates which later help country...He has more value then diamonds)
Great Explanation. A Physics Teacher myself, this is a very common mistake in many Indian textbooks (saying that it's TIR). Another argument could be if it is TIR the clarity of a Rainbow would be much better! (Hence proved ad absurdum)
As a learning student, I would like to point another important observation that most of the teachers don't spend much time researching on the topics and don't generally bother to verify the authenticity of their understanding about a particular topic. In class 10th NCERT no word as TOTAL INTERNAL REFLECTION is used but many teachers falsely misinterpret things and link the phenomenon of rainbow formation to it.
Even ncert has mentioned that angle r should be greater than critical angle in class 12 th physics part 2 page no 333 in the section of "the rainbow" 🌈
Sir, though we have conveniently taken the raindrop as a sphere, they are not perfectly spherical in real life so we might or may have total internal reflection since the angles inside the drop need not be equal
Sir maine hc verma part 1 and part 2 dono properly solve kar liya hai par aapse ek request hai ki aap question for short answer ka v answer with some clue de dijiye isse students ko sochne me aasani hogi and these are very good questions to clear all the concept
Respected sir, If we consider a stationary spherical water droplet air then your great explanation definitely holds true and I totally agree with you. But as we know that these tiny droplet move in the air but the rainbow seems to be stationary. Why? Is it because the droplets are constantly being replaced by other droplets? Also don't the droplets constantly keep changing their shape due to surface tension and the continuous changes in the atmosphere? Then shouldn't the rainbow be spread all over the place rather than having the shape it has? Thanking you A Science student
Rainbow always faces the opposite to the sun, while you stand on a straight path between the sun and rainbows. Here in Ireland, we get plenty of rain and thereafter lots of rainbows, depending on the strength of sunlight. We get not only single rainbows, also double rainbows, only sometimes. Triple rainbows are rare.
Since the rain drops are very tiny, they should not change their spherical shape....I have seen that big liquid drop fragments into smaller one...but not small liquid drop
I have great respect for you Sir. I would like to see ur explanation in English for all the topics in physics. It would help studentswho didn't know Hindi. All your efforts help students.👍
No actually he meant to say that the incident ray itself does not fall beyond the critical angle. If it did, then there would not have been any refraction. And since r is equal, the base angles of that triangle are also equal so the second refracted ray does not go beyond the critical angle by the laws of geometry and hence no TIR happens.
@@black_crest sir, but many other books say that a rain drop is act alike Prism....so, by it is not of circular shape and two sides aren't equal.....so, it can be said n that TIR happens !! ???
@@priyanshukumarsingh8638 Actually the rain drops are suspended in the air and are not under the force of gravity when a rainbow is formed. So it is assumed that the rain drops are spherical in shape Even if they were in shape of a prism, there is no saying that it is a PERFECT prism
Sir, but in your book concepts of Physics, you write.. total internal reflection takes place in the formation of rainbow. Pg. no 440, 20.8 Vol.1 Concepts of Physics
Dear sir, further increasing in Angle of Incidence (i) in water droplet (let us say i1), causes also the increase in the Angle of Refraction (r1) until r1 reaches 90°. At that point i1 is equal to Critical Angle(i1=ic). Beyond that limit when we increase the i1 further, refraction gets stopped(Because in denser medium refracted ray can't bend away from normal!) So it is bouncing back. Hence only TIR occurs! What you said is when i1 value is less than ic! Just draw and check while you increase i1 beyond ic. 🙂 pardon me if I'm wrong.. Thank you..
Hello sir , myself Omkar ,I'm now studying in 10th. I have the question about how to denote the refractive index . In different textbooks there are different suggestions . # In SSC textbook that is given like these: *The refractive index of medium 2 with respect to the medium 1. The given ratio for it is : 2n1= V1/V2 # In CBSE textbook that is given like these: * The refractive index of medium 2 with respect to the medium 1. The given ratio for it is : 1n2=V1/V2. Here , 2n1 and 1n2 .... Please give me your suggestion .
Refractive index is denoted by n or mew(the symbol for micrometre) Let's use n for now First of all we have to agree If refractive index of medium is more, in comparison to other medium, it means that light will travel slower in that So n 1(proportionality symbol) 1/V1 n1 - refractive index of medium 1 V1 - speed of light in medium 1 Now there is a medium 2 n2 - refractive index of medium 2 V2 -speed of light in medium 2 Refractive index of medium 1 with respect to medium 2 is written as 2n1 n1 - right side for the medium you are comparing Left side number, for medium you are comparing with Now speed of light thing 2n1 = V2/V1 That's it Hope it helps
@@cynide5911 please check your ans N is refractive index 2n1 means Refractive index of 1st medium with respect to second medium 2n1 = n1/n2 V1 is velocity of light in first medium V2 is velocity of light in second medium n1 = 1/V1 n2 = 1/V2 Because more the speed of light, less is the refractive index n1/n2 = 1 /V1 divided by 1/V2 So It finally becomes V2 /V1
Sir, my question is that what will happen if a ray will pass through a sphere made up of transparent glass by just touching it at only one point , that is, the ray is tangent to the sphere. PLEASE ANSWER.
see the possible case is that it wont refract if it is tangent to the circle coz it wont penetrate the sphere though it makes an angle with normal that is 90 degree but still it is out of sphere
Dear Sir, possibly I'm wrong but the raindrops which fall on the earth are not in spherical shape as you take it in the diagram so angle of refraction on the second surface is greater than critical angle due to which TIR will possible.(means according to your diagram TIR is not possible but according to the physical nature of raindrops TIR is possible.) Waiting for your reply sir 🙏
Sir had just given the example of rain drop by taking its shape as circular but in reality there is no such fixed shape of a rain drop but the concept that has been explained by sir is absolutely correct as because if the medium is even little bit transparent (translucent) then some amount of incident ray refracts and some gets reflected back. If any one of these conditions are blocked then it breaks the laws of physics.
Which of the following phenomena of light are involved in the formation of a rainbow? (a) Reflection, refraction and dispersion (b) Refraction, dispersion and total internal reflection (c) Refraction, dispersion and internal reflection (d) Dispersion, scattering and total internal reflection Sir if this question comes in exam Then which option should be tick by students please tell
@@shortube5871 Here me out, ask her again. If she still tells you the answer is B, try to quit your school(Since your teacher doesn't know how amazing science is, and she is just teaching you things which are false in the world o science). If not possible , do your own study from books. It is way more fun to study from the books you have purchased on your own than to study course books. I have studied a lot of books and also form some of the best teachers of India, and they too, will agree with me that the answer is C.
Sir in many textbook it is written that it is tir and even teacher tell us that it is tir in rainbow but if its write in paper that it is not tir is they will cut my marks??
@@adruvitpandit5816 bro many students complete hcv in 9th only those who are preparing for nsejs ..I myself has completed hcv , cengage and irodov in this lockdown period
Sir when light enters in spherical drop then it is refracting but when it comes at another side then why it reflect? because surface is same during entering time and at reflecting time.....
This whole concept work if the rain drop is in circle shape...as we know rain drop isn't a accurate circle soo... this... cant be happen ....🥲according to me ..😅😅 So its is undecribable what will happen👻
Give us Irish your Indian sun for few days every week, and we give you plenty of rains and rainbows. Fair trade? Here in Ireland, you see not only single rainbows, sometimes double rainbows.
Sir Inside the droplet (where reflection of light rays occur on boundary of circle) the angle of refraction (which you said that it is less than critical angle) is the part of the angle of reflection, then how we can say that total angle will aslo be less than critical angle?. But your explanation was Easy.
For the angle of incidence r at the boundary of droplets angle of refraction will be i as the light has entered with angle of incidence i. So no TIR takes place.
Sir but in rainbow there is critical angle and sir if there is no total internal reflection then the light of 7 colours must not be visible to us but it is visible to us how can u explain pls.and sir can u also explain that how there is no critical angle at first point.pls
I think that is the reason why secondary rainbow is fainter than primary rainbow.......at every inside reflection there is some transmission ie refraction and hence loss of "light content" . Had it been total internal refraction then there would not be losses at every step of internal reflection and both primary and secondary rainbows would have been equally brighter.
Sir your explanation is very different from other and it is excellent.
ISC Physics - CE AMPLIFIER using NPN Transistor 🔥🔥 ua-cam.com/video/9eMqZS9mYl0/v-deo.html 🔥🔥
Stay away from this click bait 👆🏻👆🏻👆🏻
A true statement
He is a legend
And this is the correct explanation
Sir ,
I personally believe, that You and the people like you are actual diamonds of our country.
They are
In fact prudentially also,their GDP share is as good as a rare gem
(Take the GDP of HC verma book and add the amount of people it educates which later help country...He has more value then diamonds)
@@binay413963 fax
Another prestigious civilization award is waiting for this great teacher
He got the Padma Shree!
Great Explanation. A Physics Teacher myself, this is a very common mistake in many Indian textbooks (saying that it's TIR). Another argument could be if it is TIR the clarity of a Rainbow would be much better! (Hence proved ad absurdum)
As a learning student, I would like to point another important observation that most of the teachers don't spend much time researching on the topics and don't generally bother to verify the authenticity of their understanding about a particular topic. In class 10th NCERT no word as TOTAL INTERNAL REFLECTION is used but many teachers falsely misinterpret things and link the phenomenon of rainbow formation to it.
@@swiftboo8120In NCERT Book TIR is not mentioned, but you will commonly find TIR in many popular books.
Thanks Verma Ji for being the leading light in our lives
Woah.. amazing explanation sir.. heartly thanks from a 2023 jee aspirant!
Even ncert has mentioned that angle r should be greater than critical angle in class 12 th physics part 2 page no 333 in the section of "the rainbow" 🌈
This video just gives the great insight in a very simple way
Sir, though we have conveniently taken the raindrop as a sphere, they are not perfectly spherical in real life so we might or may have total internal reflection since the angles inside the drop need not be equal
Sir this concept is present in your book-
Foundation Science Physics by HC Verma class 10
Yes brother I also read it the book is amazing!!
Yes, you are right
Sir maine hc verma part 1 and part 2 dono properly solve kar liya hai par aapse ek request hai ki aap question for short answer ka v answer with some clue de dijiye isse students ko sochne me aasani hogi and these are very good questions to clear all the concept
His smile and way of teaching says everything
Thank you sir. Please take care of yourself 🙏🙏
Respected sir,
If we consider a stationary spherical water droplet air then your great explanation definitely holds true and I totally agree with you. But as we know that these tiny droplet move in the air but the rainbow seems to be stationary. Why? Is it because the droplets are constantly being replaced by other droplets? Also don't the droplets constantly keep changing their shape due to surface tension and the continuous changes in the atmosphere? Then shouldn't the rainbow be spread all over the place rather than having the shape it has?
Thanking you
A Science student
Nice thought
Rainbow always faces the opposite to the sun, while you stand on a straight path between the sun and rainbows. Here in Ireland, we get plenty of rain and thereafter lots of rainbows, depending on the strength of sunlight. We get not only single rainbows, also double rainbows, only sometimes. Triple rainbows are rare.
Since the rain drops are very tiny, they should not change their spherical shape....I have seen that big liquid drop fragments into smaller one...but not small liquid drop
ISC Physics - CE AMPLIFIER using NPN Transistor 🔥🔥 ua-cam.com/video/9eMqZS9mYl0/v-deo.html 🔥🔥
Bhai tere sawaal ka jabaab mere pass h
Extremely simple yet elegant . In ncert 12th this concept is written in a little confusing manner !
Legendary Explanation
Really helpful❤
You are great sir Congratulations sir to get padma shree award 😘😘😍😍😍
I am your big fan Sir.....
I have great respect for you Sir. I would like to see ur explanation in English for all the topics in physics. It would help studentswho didn't know Hindi. All your efforts help students.👍
Sir I love your teaching because of your smile which you gives while teaching
Great video sir
The explanation was wonderful....
The reason could be of what you are saying is the water droplet is not a perfect Circle(sphere rather) so radius is not equal at both sides
No actually he meant to say that the incident ray itself does not fall beyond the critical angle. If it did, then there would not have been any refraction.
And since r is equal, the base angles of that triangle are also equal so the second refracted ray does not go beyond the critical angle by the laws of geometry and hence no TIR happens.
@@black_crest sir, but many other books say that a rain drop is act alike Prism....so, by it is not of circular shape and two sides aren't equal.....so, it can be said n that TIR happens !! ???
@@priyanshukumarsingh8638 Actually the rain drops are suspended in the air and are not under the force of gravity when a rainbow is formed.
So it is assumed that the rain drops are spherical in shape
Even if they were in shape of a prism, there is no saying that it is a PERFECT prism
Thank you sir
It has been my doubt for many days but today its cleared
Sir, but in your book concepts of Physics, you write.. total internal reflection takes place in the formation of rainbow.
Pg. no 440, 20.8
Vol.1
Concepts of Physics
It says only internal Reflection no total
SIR CAN YOU PLEASE DO A VIDEO ON
*DOPPLER EFFECT BY PARTICLE (PHOTONS) THEORY*
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I also need this.
How simply you explain, sir !!! 🙏😊👏👏👏
Thank u sir ,The God of physics ❤.
Hc verma sir =G.O.A.T🤠
Sir please make a video on Doppler effect for light waves
yes sir same thing is written in ncert
ncert says it is internal reflection.
So internal reflection hai na?
Dear sir, further increasing in Angle of Incidence (i) in water droplet (let us say i1), causes also the increase in the Angle of Refraction (r1) until r1 reaches 90°. At that point i1 is equal to Critical Angle(i1=ic). Beyond that limit when we increase the i1 further, refraction gets stopped(Because in denser medium refracted ray can't bend away from normal!) So it is bouncing back. Hence only TIR occurs! What you said is when i1 value is less than ic! Just draw and check while you increase i1 beyond ic. 🙂 pardon me if I'm wrong.. Thank you..
you are absolutely right!
For tir light should travel from dener to rarer
Sir concept of physics part2 in Hindi version
Aek dam say concept badal gaya sir 🔥🔥🔥
Hello sir , myself Omkar ,I'm now studying in 10th.
I have the question about how to denote the refractive index .
In different textbooks there are different suggestions .
# In SSC textbook that is given like these:
*The refractive index of medium 2 with respect to the medium 1.
The given ratio for it is : 2n1= V1/V2
# In CBSE textbook that is given like these:
* The refractive index of medium 2 with respect to the medium 1.
The given ratio for it is : 1n2=V1/V2.
Here , 2n1 and 1n2 ....
Please give me your suggestion .
Refractive index is denoted by n or mew(the symbol for micrometre)
Let's use n for now
First of all we have to agree
If refractive index of medium is more, in comparison to other medium, it means that light will travel slower in that
So
n 1(proportionality symbol) 1/V1
n1 - refractive index of medium 1
V1 - speed of light in medium 1
Now there is a medium 2
n2 - refractive index of medium 2
V2 -speed of light in medium 2
Refractive index of medium 1 with respect to medium 2 is written as
2n1
n1 - right side for the medium you are comparing
Left side number, for medium you are comparing with
Now speed of light thing
2n1 = V2/V1
That's it
Hope it helps
@@cynide5911 please check your ans
N is refractive index
2n1 means
Refractive index of 1st medium with respect to second medium
2n1 = n1/n2
V1 is velocity of light in first medium
V2 is velocity of light in second
medium
n1 = 1/V1
n2 = 1/V2
Because more the speed of light, less is the refractive index
n1/n2 = 1 /V1 divided by 1/V2
So
It finally becomes
V2 /V1
Both the notations are correct . You can use any of these , believe me
Sir, my question is that what will happen if a ray will pass through a sphere made up of transparent glass by just touching it at only one point , that is, the ray is tangent to the sphere.
PLEASE ANSWER.
see the possible case is that it wont refract if it is tangent to the circle coz it wont penetrate the sphere though it makes an angle with normal that is 90 degree but still it is out of sphere
sir your expansion is just excellent. very nice
Finally I can oppose my teacher for this topic 😅
Dear Sir, possibly I'm wrong but the raindrops which fall on the earth are not in spherical shape as you take it in the diagram so angle of refraction on the second surface is greater than critical angle due to which TIR will possible.(means according to your diagram TIR is not possible but according to the physical nature of raindrops TIR is possible.) Waiting for your reply sir 🙏
Keep waiting
That's what I was thinking too.
Realistically no raindrops are perfect spheres .
Esa hi kuch main soch raha tha
Sir had just given the example of rain drop by taking its shape as circular but in reality there is no such fixed shape of a rain drop but the concept that has been explained by sir is absolutely correct as because if the medium is even little bit transparent (translucent) then some amount of incident ray refracts and some gets reflected back. If any one of these conditions are blocked then it breaks the laws of physics.
Sir...u r the best....your explanation is excellent
Really it's a 100%perfect answer sir
Now all doubt is clear. Thanks a lot sir jee.
Wow sir!!
Your explanation is so easy to understand. Great sir..
Wow sir , what a logical explanation
Which of the following phenomena of light are involved in the formation of a
rainbow?
(a) Reflection, refraction and dispersion
(b) Refraction, dispersion and total internal reflection
(c) Refraction, dispersion and internal reflection
(d) Dispersion, scattering and total internal reflection
Sir if this question comes in exam
Then which option should be tick by students please tell
I am also confused
Option c will be correct
@@rohansrivastava3295 nope B
My mam told
But I'm too confused
@@shortube5871 Here me out, ask her again. If she still tells you the answer is B, try to quit your school(Since your teacher doesn't know how amazing science is, and she is just teaching you things which are false in the world o science). If not possible , do your own study from books. It is way more fun to study from the books you have purchased on your own than to study course books. I have studied a lot of books and also form some of the best teachers of India, and they too, will agree with me that the answer is C.
@@rohansrivastava3295 woah...i gota take my tc then😂...im in 10 so i can't in between but yeah.. Tnkss
Legend for a reason
Aap kya padhate kaash main mil kr bta skta maza aa gya
Thank u sir from the bottom of my heart
Thank you so much sir
Absolutely point to point explanation
the explanation was just awsm
Sir in many textbook it is written that it is tir and even teacher tell us that it is tir in rainbow but if its write in paper that it is not tir is they will cut my marks??
Thanks a lot sir from Russia!
My god SIR HC verma
I believe there is partial internal reflection and not total.
There is no Concept of partial internal reflection. There is just total internal reflection and reflection
Sir you are really great
Sir I purchase you book in class 10 and in this book you write
internal reflection not total internal reflection.
10th WOW, i studied it first when i started preparing of JEE in 11th, Newtonian mechanics and Advanced physics starts in 10th these days?
@@adruvitpandit5816 in 10th book foundation for iitjee this is there in the chapter light reflection and refraction class 10
@@tavishbhardwaj2819 Ohh i am amazed there are foundation courses starting from 10th itself these days. I passed long time back.
@@adruvitpandit5816 bro many students complete hcv in 9th only those who are preparing for nsejs ..I myself has completed hcv , cengage and irodov in this lockdown period
So Interesting topics
how hard you wrote your books sir?....too tough but great
Excellent explanation.
Sir your explain always amazing
Very logical explanation 👌
Yrr.. Yeh toh kamal ka h ❤💕
sir your explanation is very good
Why circle? Why does the shape of rainbow circle?
Menz evry book giving wrong information about Rainbow formation......Thnku sr it ws a nyc explaination.u hv kpt no doubt.evrythng is in black n white
Thank u very much sir
Helped a lot
Sir when light enters in spherical drop then it is refracting but when it comes at another side then why it reflect? because surface is same during entering time and at reflecting time.....
No because incident angle is great than 90 ° so it reflects
@@rahilvahora165 if it's is more than 90 means it's a TIR
Excellent explaination 🤗
Thank you so much sir ,it was crystal clear.
But the rain drop is not perfectly spherical therefore will the concept not change in real life?
Excellent explanation sir. Thanks a lot.
nice explanation sir
God of physics
Many teachers are learning here
Had there been total internal reflection the rainbow would appear crystal clear and that does not happen. We get only faint image of it
thanks, hcv sir 🇨🇮
This whole concept work if the rain drop is in circle shape...as we know rain drop isn't a accurate circle soo... this... cant be happen ....🥲according to me ..😅😅
So its is undecribable what will happen👻
Sir, Can total internal refraction take place when light is going from optically rarer medium to optically denser medium?
I dont think so buddy
No
No
no not at all
No
Respected sir, water drop is not always spherical. So in that case TIR may take place as the two angles will not be same.
Yes sandeep I think you are right
Ya it may possible
Great man of india
Sir your video is awesome....
Give us Irish your Indian sun for few days every week, and we give you plenty of rains and rainbows. Fair trade?
Here in Ireland, you see not only single rainbows, sometimes double rainbows.
Well, the trade's upto the nature..... Can't do anything.....
Done.
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We must see nth order rainbow
You are free to take sun. We will gift it to you without asking anything in return from you.
Sir r can be greater than critical angle because the TIR depends on media too.light must be going from denser to rarer medium.so there is TIR
Sir
Inside the droplet (where reflection of light rays occur on boundary of circle) the angle of refraction (which you said that it is less than critical angle) is the part of the angle of reflection, then how we can say that total angle will aslo be less than critical angle?.
But your explanation was Easy.
For the angle of incidence r at the boundary of droplets angle of refraction will be i as the light has entered with angle of incidence i. So no TIR takes place.
Thank you sir for clear my confusion
Wonderful explain sir
Sir , why when ray of light goes inside the droplet then REFRACTION is take place and after that how droplet reflect ray of light 🤔🤔🤔🤔
Very nice information Sir ji
Thank you sir. Learnt a new concept today!!
Respected sir
I remember that you teach in IIT
Kanpur
My favorite physicians
#1:HC Verma Sir
#2:Walter Lewin Sir
#3: and the best Alakh Pandey Sir
How can you even compare Alakh pandey with HC Verma or Walter Lewin..Are you crazy my boy..
Love you sir
But critical angle is always said to incidence angle and not refracted angle
Sir but in rainbow there is critical angle and sir if there is no total internal reflection then the light of 7 colours must not be visible to us but it is visible to us how can u explain pls.and sir can u also explain that how there is no critical angle at first point.pls
great explination
WOW LEARNT NEW CONCEPT
is it a robotic camera,
which sir is using???????????
I think that is the reason why secondary rainbow is fainter than primary rainbow.......at every inside reflection there is some transmission ie refraction and hence loss of "light content" . Had it been total internal refraction then there would not be losses at every step of internal reflection and both primary and secondary rainbows would have been equally brighter.
Thanks sir 🙏🏻🙏🏻
Absolute brilliance
Sir please make video on the question that
Why potential difference is same in parallel combination?
{Class 10}