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Question:

A spherical mirror and a thin spherical lens have each 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 and the lens is convex.

(d) the mirror is convex, but the lens is concave.

Answer:

The correct option is (a).

(a) Both concave.

The given focal length of spherical mirror and lens is negative and we know the focal length is negative for concave according to the sign convention.

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