To produce a parallel beam of light from a concave mirror, the distance at a...

JAMB 1994

To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to

A. the focal length
B. two times the focal length
C. the distance of the image
D. two times the radius of curvature

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Correct Answer: Option A

Explanation

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To produce a parallel beam of light from a concave mirror, the distance at a...

Correct Answer: Option A

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