Physics Help Forum Inteference of light ray in thin flim

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 Aug 31st 2014, 05:12 PM #1 Senior Member   Join Date: Jun 2014 Posts: 306 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?
 Sep 1st 2014, 09:28 AM #2 Senior Member     Join Date: Apr 2008 Location: Bedford, England Posts: 668 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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