A soap fi lm (n 5 1.33) is 465 nm thick and lies on a
Chapter , Problem 54(choose chapter or problem)
A soap fi lm (n 5 1.33) is 465 nm thick and lies on a glass plate (n 5 1.52). Sunlight, whose wavelengths (in vacuum) extend from 380 to 750 nm, travels through the air and strikes the fi lm perpendicularly. For which wavelength(s) in this range does destructive interference cause the fi lm to look dark in refl ected light?
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