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Old Aug 31st 2014, 05:12 PM   #1
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Inteference of light ray in thin flim

Inteference of light ray in thin flim

according to the notes in the photo, the light ray undergo of phase change of 0.5 λ when it strike and reflected from glass surface (denser) at point A . so the OPD of ray 1 &2 = 2nt-0.5λ..
but my another book (same condition as above) , give the OPD of ray 1 & 2 is given by 2nt+0.5λ
WHICH ONE IS CORRECT?

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Old Sep 1st 2014, 09:28 AM   #2
MBW
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I note that the difference between the two methods of calculation is exactly one full wavelength.
This means that the phase calculated by either method is identical.
However, I agree that it is confusing, and conceptually unsatisfying, to have two different versions of the "standard" equation.
One should be "correct" (even if both give the same answer).
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