Question

A concave mirror forms an image, on wall 3m from mirror, of the filament of a headlight lamp 10 in front of the mirror. What are the radius of curvature and focal lengt
h of mirror​

Answer 1

Answer:

For all mirrors, we have the equation 1/f = 1/do + 1/di. In this case, do = 10e-2m = 0.1m, di = 3m. So 1/f = 1/0.1 + 1/3 = 10.33, f = 9.7cm. R = 2f

=19.4cm.

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