SAT Subject Physics Practice Question 444: Answer and Explanation

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Question: 444

5. A light ray is moving parallel to the principal axis of a concave mirror, which it strikes. How will the light ray be reflected?

A. Back upon itself
B. Through the focal point
C. Through the radius of curvature
D. Through a point equal to 0.5f
E. Through a point equal to 2r

Correct Answer: B


The correct answer is (B). A ray parallel to the central radius is reflected through the focal point.

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