A puddle of water has a thin film of gasoline floating on it. A beam of light st
ID: 2257350 • Letter: A
Question
A puddle of water has a thin film of gasoline floating on it. A beam of light strikes the film perpendicularly. If the film is 120 nm thick and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what wavelength of visible light will yield a bright reflection?
A puddle of water has a thin film of gasoline floating on it. A beam of light strikes the film perpendicularly. If the film is 120 nm thick and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what wavelength of visible light will yield a bright reflection?Explanation / Answer
wavelength/2 = 2d(mu)
wavelength = 4*120*1.4
= 672 nm
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