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SAT® Subject Test in Physics

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Index of Refraction of Plastic

SATPHY-1YMEFJ

Below is a drawing made by a student that represents a light ray entering a piece of plastic and passing into the plastic. The student drew the original light ray to enter the plastic at a 60.0 degree angle with the normal as pictured.

He was able to look through the plastic and line up a ruler with the original light ray he drew to measure the angle of the light ray in the plastic. This angle is labeled in the drawing. The student used his drawing to determine the index of refraction for the plastic.

What value did he determine?

A

1.66

B

0.602

C

1.47

D

0.68

E

1.38