Monochromatic light of variable wavelength is

Chapter 34, Problem 34.50

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Monochromatic light of variable wavelength is incidentnormally on a thin sheet o f plastic film in air. The reflectedlight is a minimum only for A = 491.4 nm andA = 688.0 nm in the visible spectrum. What is the thickness ofthe film (n = 1.58)? [Hint Assume successive values of ra.]

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