What are the two smallest thicknesses of a thin film of material with index of refraction 1.25 that will produce destructive interference for 550 nm light, if the coating is placed between air and crown glass?  Assume the light shines perpendicularly onto the coating.

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
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Chapter36: Applications Of The Wave Model
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What are the two smallest thicknesses of a thin film of material with index of refraction 1.25 that will produce destructive interference for 550 nm light, if the coating is placed between air and crown glass?  Assume the light shines perpendicularly onto the coating.

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