A light beam is incident from a medium with n_1 through a thin layer of a substa

Question

A light beam is incident from a medium with n_1 through a thin layer of a substance with n_2 into a medium with n_3 (layer darkness in the figure does not indicate the relative magnitudes of the indices of refraction). If n_1 = 1.2, n_2 = 2.3, and n_3 = 1.6, and the thickness of the middle layer is 145 nm, for which (visible) wavelength does the reflected beam undergo destructive interference? 667 nm If instead n_2 = 1.6 and n_3 = 2.3, which one of the following would be true for the same wavelength? Incorrect Interference would now be constructive. Incorrect Interference would still be destructive. Correct: Neither constructive nor destructive.

Explanation / Answer

A point where neither constructive nor destructive interference comes when two waves partially re-inforce or partially cancel, depending upon the position.

This is ALSO HAPPEEN WHEN TWO WAVES ARE IDENTICAL

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