# Ch 27, problem 9Light of wavelength 580 nm (in vacuum) is incident perpendicularly on a soap film (n = 1.35) suspended in air. What are the two smallest nonzero film thicknesses (in nm) for which reflected light undergoes constructive interference? Let (a) be the smaller of the two values. Let (b) be the larger of the two values.

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Ch 27, problem 9

Light of wavelength 580 nm (in vacuum) is incident perpendicularly on a soap film (n = 1.35) suspended in air. What are the two smallest nonzero film thicknesses (in nm) for which reflected light undergoes constructive interference? Let (a) be the smaller of the two values. Let (b) be the larger of the two values.

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Step 1

The condition for the constructive interference is

Step 2

(a) The smallest non-zero film thickness...

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### Ray Optics 