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What is the thinnest film of a coating with n = 1.38 on glass (n=1.52) for...

What is the thinnest film of a coating with n = 1.38 on glass (n=1.52) for which destructive interference of the red component (640 nm) of an incident white light beam in air can take place by reflection?
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Answer #1

The formula for destructive interference in this case is ...

2nt = (m + .5)λ

(2)(1.38)(t) = (.5)(640 X 10-9)

t = 1.16 X 10-7 m (116 nm)

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