A beam with wavelength λ falls on a stack of partially reflecting planes with separation…
Physics · JEE Advanced · NTA Exams — Optics
A beam with wavelength λ falls on a stack of partially reflecting planes with separation d. The angle θ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)
- \(\sin ^{-1}\left(\frac{n \lambda}{d}\right)\)
- \(\tan ^{-1}\left(\frac{n \lambda}{d}\right)\)
- \(\sin ^{-1}\left(\frac{n \lambda}{2 d}\right)\)
- \(\cos ^{-1}\left(\frac{n \lambda}{2 d}\right)\)
Answer
(C) ^ -1 ( n 2 d )
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