A spherical mirror and a spherical lens each have a focal length of, –15 cm. The mirror and the lens are likely to be:(a) both concave.(b) both convex.(c) the mirror is concave but the lens is convex.(d) the mirror is convex but the lens is concave.
(a) both concave
Explanation
When a spherical mirror and a spherical lens each have a focal length of, $-$15 cm, then the mirror and the lens are likely to be concave, because according to the sign convention, the focal length for both a concave mirror and a concave lens is negative.
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