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SAT® Subject Test in Physics

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Lens Coating Interference

SATPHY-VJ71QF

A thin film with an index of refraction of 1.50 coats a glass lens. The index of refraction of the glass is 1.60.

What is the thinnest coating of film that will provide for very strongly reflected $546\ nm$ light (constructive thin film interference)?

A

$171\ nm$

B

$182\ nm$

C

$91\ nm$

D

$273\ nm$

E

$415\ nm$