Huygen's principle of secondary waves | Wave optics | Physics | Khan Academy

Huygen's principle states every point on the current wavefront acts as a source of secondary spherical waves. These secondary waves propagate outwards, in the forward direction, and a common tangent (an envelope) to all these waves constitute the new wavefront.
More free lessons & practice
www.khanacademy.org/science/i...
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: www.khanacademy.org/donate?ut...
Created by Mahesh Shenoy

[@tia568]

sometimes i wonder how the ancient people understood the theories and principles without animations...we're so blessed. thank u!!

[@shivanisoni3339]

They had an amazing power called imagination and their hypothesis too are so correct, which are based on these imagination only.

[@879-0]

Imagination is everything

[@zakirshah5060]

Imagination is important than knowledge in physics Einstein

[@duggchi5277]

Yes we are

[@khalidgustavo5903]

You all probably dont give a shit but does someone know of a tool to log back into an Instagram account??
I somehow lost the login password. I would appreciate any tricks you can offer me.

[@hanniehmar8885]

Huygens principle couldnt possibly be explained better than this, you did a terrific job!

[@kperiyasamy216]

Still his videos are underratted, hope everyone utilizes it

[@Puh539]

I just want to say "Thank u sir "

[@toluenestar2172]

You just come up with really amazing questions which arise in curious minds and u explain to a naive really well

[@user24180]

I DONT KNOW HOW MUCH TO THANK YOU. BOTH MY SCHOOL AND TUITION TEACHERS ARE VERY BAD AT TEACHING PHYSICS AND I JUST GET VERY CONFUSED WHEN THEY TEACH.
I STRUGGLED SO MUCH WITH THIS CHAPTER AND FINALLY DECIDED TO START AFRESH. YOU EXPLANATION IS AMAZING SIR.
THANK YOUU SOO SOO MUCH. I CAN FINALLY UNDERSTAND THIS TOPIC. 💙

[@arunav_creations]

The teaching is just perfect.❤️

[@alihasanamu]

Wow so beautifully explained !
No fears like in those coaching-led videos to get it until exams are finished huff🙃

[@shifaabuzar4533]

the most underrated channel on youtube. i mean c'mon he explains so gooood

[@dazaiosamu3660]

FInally understood the undeerlying concept behind Huygen's principle. Thanks for all the videos

[@vivekgupta3692]

Wow 3 videos back to back .... Awesome thank you 👍

[@abubakrialliy3350]

I always had problem in answering questions on this principle but no more
Thank you
You're one of the best ❤❤

[@Rohan_Mahato]

This is what I was finding. Thanks

[@anushkakohle7769]

Thank you so much for the explanation🙏🏻 It really helped me

[@bbeee_a]

'' imagining lights as waves and not bullets '' wise words!!

[@riyarai1086]

Beautifully explained 🤞

[@smartview8193]

you are the most amazing physics teacher for me.

[@luwi8125]

Thanks for the lesson! :)
What program did you use to draw the illustrations? It really made them look good.

[@smarthereafter5992]

thank you very much for your effort.

[@physicsweb8697]

Amazing teaching style...really superbbbbb ❣️❣️❣️

[@aamirahmed7659]

Thanks for the amazing explanation.

[@helaluddin182]

amazing....❤❤❤❤

[@icarus3797]

Thanks a lot ,sir.

[@brandideruiter6067]

I have been struggling with understanding this and this video gave me so many ah ha moments. Thank you so much. Best explanation I have some across. 🙏

[@mihreteabgirma6351]

You are the best! Love you bro🤩 Keep up the good work!

[@prayanshsharma1832]

One of the best teacher ever..
Thank you so much

[@mineshbairagi8503]

Fantastic explanation

[@dannyperron6498]

What a good explanation. Thank you.

[@anitkumar8484]

Best explanation ever in summary

[@aroobsheraz6932]

you're so skilfull. amazing explanation

[@irshadbaig9946]

Super explaination bro.

[@nikhiltewari9524]

Excellent video and teacher altogether. Commendable job 🎉

[@johnraj03]

Thank you very much sir
Great explanation sir
I understood every point sir
Thanks 🙏🙏🙏

[@bismayoosaf4156]

Thank you sir..ur way of teaching is really amazing..

[@UmangShah-105base8]

06:08
Actually here , the wave contribution is proportional to ½[cos(¤)+1] and for the backwards direction cos¤ would be 180
i.e -1 , ½[-1 + 1] = 0

[@sakthivignesh3877]

God level explanation 💯💯

[@boaz2453]

Well Explained

[@vivekgupta3692]

100k congratulations

[@firstjm9071]

Thank you !!!

[@jetome5909]

Explanation in english is what i need 👌

[@YashpalSingh-mu4cp]

Thanks a lot sir...😊

[@prathameshprafulhole2662]

This was so damn good!
I don't have words to describe it!

[@rank_ki_taiyari]

I am thankfull

[@physicslab5787]

Nice

[@abdullahkhalid6090]

wow wow wow sir. thank u very much

[@prabapraba3091]

U r awesome man

[@nikhil_IITK]

Thank you sir what a good explanation

[@arnabdas2416]

Thank you, sir.

[@jatinbhatt7826]

Sir, what software u use to create such an amazing animation?

[@arnabdas2416]

thank you, sir.

[@karthikchowdhari3094]

👍👍👍 thanks

[@Lakshyaverma777]

Wow.......😍😍🥰🥰🤩🤩

[@marvhartigan3677]

Very nice. This guy is a gem , literally a fucking gem. Brilliant work my man.

[@Hemanthdev10]

This is underrated fr

[@_navamusic3054]

Much better than PW nautankis... !!!

[@erenyeager6668]

I appreciate it

[@PujithaKandula-tm3ts]

Please explain the fresnels diffraction briefly

[@user-vg1qn2vy7r]

Thi's is good ❤

[@ishitarai9050]

Yessss, mahesh sir on the channel

[@arya4532]

Thank you sir

[@virupannamedikinal]

Some people are unlucky for having not watched these useful videos.

[@samikshadongare9548]

Well ..I wanted to try this but was too lazy to gather all the stuff .. .so I one day just partially closed my eyes, uk with my eyelashes right above my pupil and looked at a distant street light ( kind of replicating the small hole in the cardboard) ...I did actually see how the light rays kind of scatter ...if i look at that street light (which is actually a small bulb) with my eyes open its a different picture while its different with eyes almost closed

[@sashwatyo1293]

OMG WAVEFRONTS ASTOUND ME!!!!! 5:30 IS IMPECCABLE

[@The_Divert]

Thanks for explaining this but what app are you using for drawing those?

[@ananyaupadhyay5821]

amazingggg

[@VG__]

4:55 secondary wavelet
9:29

[@The_Divert]

Thanks

[@VishalKashyap-xv1kt]

What happens in the case of a laser light Or a laser beam ? Why doesn't it spread?

[@sandrasunny5885]

so what happens if it enter again a finite hole .it's gona be again curved or straight or mix...................

[@wavetraced]

7:30 why would the ripples suddenly begin at the slit? Shouldn't they have been rippling from the source?

[@dreamskeepmeawake2959]

Tysm

[@siyaramsingh7915]

🙏🙏🙏🙏🙏

[@sathwikbandi5751]

Sir u have shown a 2d wavefronts But I am unable to imagine 3d wavefronts.please can u create 3d wavefronts

[@MemoMemo-ly2si]

❤❤❤

[@vasupatel1567]

Can it's drawback is related to Q.M
Coz his and youngs slit experiment are starting points of Q.M

[@sumankalyantripathy7413]

At 0:51, why is light shown as longitudinal waves, while it’s a transverse wave?

[@ryanizanami4866]

Yes.

[@sashwatyo1293]

Sir I did a project on FRACTALS........and THE CONCEPT OF SECONDARY WAVELETS FOLLOW that !! INFINITE AREA OF WAVEFRONTS!!!!!

[@Sara_sami_0]

Wwoow i want to see that!

[@hemanibijja2160]

crazy

[@sudheerv6941]

Can a common tangent be a curve?

[@amanamin3685]

Wait huygens principle only applies to light right?

[@charleszr853]

I dont get one thing, so when the plane wave came in from a source the edges didnt bend. But after going through slit, you included the round edge. But shouldnt that also apply to the wavefront before the slit since its also a finite wavefront?

[@mumthas8870]

It doesn’t bent cuz it not a finite plane ,

[@charleszr853]

@@mumthas8870 but how is the wavefront that pass through the slit not a infinite wavefront? Its the exact same as the plane wave coming in but just shorter?

[@NisarAhmad-em2nm]

Like❤❤❤

[@duggchi5277]

Brain

[@wavetraced]

3:10 If the light is moving at light speed, how can the secondary waves move faster? Shouldn't any secondary waves be behind a primary wave?!

[@Shrreyy]

I have the same doubt!!

[@Shrreyy]

I think that a secondary wave is just an interpretation of the primary wave after a given time, I mean it tells how the primary wave would look like in the other second or how it will travel.

[@stripisantisocial.]

Watching before 5hrs before exam

[@user-ts8rc7cn1r]

How was exam?😅

[@stripisantisocial.]

@@user-ts8rc7cn1r passed

[@studentjoansalvadorlopezbo1836]

El huygens ese tiene un morro que se lo pisa y no tiene ni idea

[@IITB_Vikash]

But ether does not exist???

[@broteendas1194]

The like dislike ratio says it all

[@nafistoki414]

Regretting why I have hated this chapter. 😖

[@souvikmakur9695]

trying to change accent.

[@aridislam7554]

Thanks