Question: The condition for constructive interference by reflection from a thin film in air, as developed in Section 24.4, assumes nearly normal incidence.(a) Show that for

The condition for constructive interference by reflection from a thin film in air, as developed in Section 24.4, assumes nearly normal incidence.(a) Show that for large angles of incidence, the condition for constructive interference of light reflecting from a thin film of thickness t, with index of refraction n, and surrounded by air may be written aswhere θ2 is the angle of refraction.(b) Calculate the minimum thickness for constructive interference if sodium light (λ = 590 nm) is incident at an angle of 30.0? on a film with an index of refraction of1.38.

- (n+-). 2nt cos 02

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