Sir at 19:30 The in ques nothing is mentioned Whether its reflected or transmited how did u identify formula Also sir u wrote reflected system D.i. condition is minina but u wrote maxima formula
When we add lambda/2 only once then there will be phase change of 180 degrees. When we add lambda/2 two times then the phase change will be 360 degrees which is equivalent to zero. So adding two times lambda /2 is equivalent to not adding lambda as there is no phase change introduced.
Use simple logic.. if n1 is smaller then lambda1 is larger.. check the two equations that we have written. These equations have left side same. So, for small value of n1, lambda1 should be more..
Sir at 19:30
The in ques nothing is mentioned
Whether its reflected or transmited how did u identify formula
Also sir u wrote reflected system D.i. condition is minina but u wrote maxima formula
Sir why we used the 2n-1 lambda/2 formula ,why not 2n+1lambda /2
You can use (2n+1)λ/2 also. But then n=0,1,2,3...
At 10:16 why are we taking n=1
For minimum thickness of the film
In 2nd Q why you didn't convert the thickness of film from CM to Angstrom??
That can also be done.. I have written answer directly in Angstrom
Sir , how is adding two times lambda /2 is equal to not adding lambda at all?
Thank you sir for the lecture ☺️
When we add lambda/2 only once then there will be phase change of 180 degrees. When we add lambda/2 two times then the phase change will be 360 degrees which is equivalent to zero. So adding two times lambda /2 is equivalent to not adding lambda as there is no phase change introduced.
@@EngineeringPhysicsbySanjiv Thank you sir
sir you have taken labmda(1) as 7000 A , why is it so?? (in last question) , what if we take 5000 A as lamda (1)
Use simple logic.. if n1 is smaller then lambda1 is larger.. check the two equations that we have written. These equations have left side same. So, for small value of n1, lambda1 should be more..
Sir in last Question it is mentioned Destructive how you use formuale of maxima then ..formuale should be of minima na?
because reflection t denser medium took place two times. So lambda/2 is added two times.
Sir what if range of wavelength is not given in question? How to get the answer
by default the range of visible light is between 4000 and 7000
Why should not we use 2miut=nlambda
Because we need to use condition for maximum (strongly reflected)
Sir numericals me n-lambda aur n+lambda kab use karte hai? Sir please tell me
if you count n from 0 then use (2n+1)λ/2 and if you count n from 1 then use (2n-1)λ/2
@@EngineeringPhysicsbySanjiv thank you sooo much sir!!
So long no videos 😭?
Started posting again..
Could you plz provide that pdf
Engineering Physics Notes links
drive.google.com/file/d/1Ikw8Z0T6GRiRNnNOcjAK5Awprm0m9pXt/view?usp=drivesdk
drive.google.com/file/d/1DK4jO1E-8qEojxkqHrDOwsefhAQ9iqkv/view?usp=drivesdk
Thank you sir 😃
Welcome