Question

A spherical mirror and a thin spherical lens have each a focal length of -15 cm .The mirror and lens are likely to be​

Answer 1

both concave

both concave mirror and concave lens has negative focal length.

Answer 2

Answer:

Explanation:

Since the mirror and lens are spherical, these may be concave or convex.

As the focal length is positive +25 for both lens as well as mirror, so both of these are convex, i.e. the mirror is likely to be convex mirror and lens is likely to be convex lens.

This is because convex lens or convex mirror has always positive focal length.

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