Exercise $35\mathrm{.}23-$ Enhanced $-$ with Feedback

$26$ of $30$

Review

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Constants

Part A

What is the thinnest film of a coating with nn $=1\mathrm{.}41$ on glass $($nn $=1\mathrm{.}52)$ for which destructive interference of the red component $(640$ nmnm$)$ of an incident white light beam in air can take place by reflection?

Express your answer in nanometers.

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nmnm