Question: The condition for constructive interference by reflection from a thin film in air as developed in Section 37.6 assumes nearly normal incidence. What If? Show

The condition for constructive interference by reflection from a thin film in air as developed in Section 37.6 assumes nearly normal incidence. What If? Show that if the light is incident on the film at a nonzero angle .1 (relative to the normal), then the condition for constructive interference is 2nt cos θ 2 = (m + ½) A, where θ2 is the angle of refraction.

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