for first reflection we took additional path lag of (lambda/2) for path difference. similarly when second reflection occurs inside the thin film, shouldn't there be an additional path lag of (lambda'/2) for extra path difference where (lambda' is the wavelength of light in film)?
9 years ago
by
Naveen Nallusamy
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No, because path lag occurs only when light in rarer medium is reflected from denser medium.
9 years ago
by
Kartik Choudhary
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when it is travelling from rarer to denser phase change of pi occurs so lambda/2 path difference whe it is travelling from denser to rarer no phase change occurs if u still dont understand watch https://www.youtube.com/watch?v=HhY4A0LsF_s&list=PL3Wi397dlS-H8yjZEN3ocuPdOnHmNKuAA&index=16
9 years ago
by
akanksh
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3
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It's a paid video.
If you have problem understanding the concept(of the path difference one) then search phase difference due to reflection of wave and read the physics stack exchange article,it is really helpful
6 years ago
by
Akshunn Trivedi