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SAT® Subject Test in Physics

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Soap Bubble Interference

SATPHY-KX9EFL

Soap bubble fluid has an index of refraction about the same as water ($n = 1.33$).

If the film of a particular soap bubble is $122\ nm$ thick at a certain spot, what wavelength of light is being most strongly reflected from this spot on the bubble?

A

$325\ nm$

B

$216\ nm$

C

$467\ nm$

D

$649\ nm$

E

$587\ nm$