Fabry Perot Interferometer

[@Avalanchanime]

WAAAAAY better than Wikipedia.

[@trapItaliana]

2:37 best beat switch ever

[@Avalanchanime]

Mark another one for *daddy Pitagoras*

[@harshitabhuyan8892]

please explain why the shape of the fringes are circular.

[@popkornking]

Probably due to the geometry of the focusing lens.

[@pavanajsridhar939]

Is there any phase change as light travels from rarer to denser medium ie stokes law??

[@Shaziakhan75557]

No , there is no phase change as light travels from one medium to other (refraction) , while the phase changes by 180 during reflection.

[@FiduzP88]

The path difference at 3:39 is 2*d*cos(Theta). However, at 4:00 the path difference is written as d*cos(Theta) which is then put equal to m*lambda...shouldn't it be 2*d*cos(Theta)=m*lambda, in order to have constructive interference?

[@akshanshchoudhary7397]

Federico Pevere you are right It​ is 2dCos(x)

[@harshitabhuyan8892]

can someone tell me why the pattern is circular?

[@SuperCuriousFox]

@@harshitabhuyan8892 Sorry for the late answer, but I believe the pattern is circular because constructive interference can only occur at certain angles \theta between the incident ray and the optical axis (the horizontal line). In a 2 dimensional system, you would therefore obtain a typical "on-off" interference pattern, but in a 3 dimensional one this pattern is rotated around the optical axis. The shape of the lens is also a factor, because only a radially symmetric lens will create such a pattern.

[@simpleprogramming5369]

Hello, thanks for the explanation. I have a question: Unlike the other phenomena when we calculate the path difference, in the Fabry Perot interferometer there is the minus (2AB-CD) I would like to know why do we use minus?

[@Dyslexic_Neuron]

becoz that is the path the first ray travels extra after getting transmitted from plate2

[@넹네리-n1q]

I have a question about path difference(3:40). Does it mean that I moved as much as the CD during the time that moved from BA to B'A inside the etalon?

[@spc8905]

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[@hrishikeshingole5625]

Thank you so much!!!!❤❤❤❤

[@Frutos-secos]

GRACIAAAAASSS!

[@Frutos-secos]

@Maximilian Marcel did you find anything interesting?

[@edu4824]

Very nice sir! I have understood all the things. I want to request you to upload a video on origin off circular fringes in michelson Interferometer...

[@sanampallegowtham7571]

how did the path difference became 2dcostheta

[@SalamaOmarSalama]

Why don't you take into account the value of cd?!!

[@tubupima5492]

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[@mehdifeizzadeh7598]

THANK U !

[@spc8905]

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[@manojkumarreddy2754]

very useful .............. thank u

[@elefectoxalamito]

Very useful! Thank you \O.O/

[@pangasius1372]

great, thanks !

[@mukun8an]

Thank you :)

[@oliva8282]

thks!

[@mayankmittal9305]

nice and simple intro

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good content

[@praveenkumarmahato6445]

Thanks sir

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[@therealkeshavsehgal]

Good for beginners Thanks 😐😐😐

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[@spc8905]

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[@ContinuumIIT]

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