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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > 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 planes so that the beams reflected from successive planes may interfere constructively is (where n=1, 2, …)

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 planes so that the beams reflected from successive planes may interfere constructively is (where n=1, 2, …)

Distance "d" between S1 and S2 is