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 1

Answer:

both concave

Explanation:

as focal length of concave mirror and concave lens is always negative

Answer 2

Answer:

Both concave.

Explanation:

Given that, a spherical mirror and a thin spherical lens have each a focal length of -15 cm. The focal length of both concave mirror and lens is negative. Focal length is defined as the distance between pole an the focus of the mirror.

Hence, the correct option is (a) "both concave".

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