Problem: Light traveling in air is incident perpendicular to the surface of a thin film of plastic that is on the surface of a sheet of glass. The plastic film is 200 nm thick and has refractive index 1.60. The glass has refractive index 1.40. For what wavelengths of light (in air) within the limits of the visible spectrum (λair = 400 nm to 700 nm) is there destructive interference between the light reflected from the top and bottom surfaces of the plastic film?

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Problem Details

Light traveling in air is incident perpendicular to the surface of a thin film of plastic that is on the surface of a sheet of glass. The plastic film is 200 nm thick and has refractive index 1.60. The glass has refractive index 1.40. For what wavelengths of light (in air) within the limits of the visible spectrum (λair = 400 nm to 700 nm) is there destructive interference between the light reflected from the top and bottom surfaces of the plastic film?

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Our tutors have indicated that to solve this problem you will need to apply the !! Thin-Film Interference concept. If you need more !! Thin-Film Interference practice, you can also practice !! Thin-Film Interference practice problems.

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