Question

A spherical mirror and a thin spherical lens each have a focal length of -15cm. The mirror and 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 and the lens is concave​

Answer 1

the both lens and mirror are concave because the concave lens and concave mirror have negative focal length..

Answer 2

Both concave

(a) is correct option

Explanation:

Given that,

A spherical mirror and a thin spherical lens each have a focal length of -15 cm.

Focal length :

Focal length is the distance between the center of the lens and its focus.

If the focal length is positive then the lens and mirror are convex.

If the focal length is negative then the lens and mirror are concave.

Here, the focal length is -15 cm.

Therefore, The lens and mirror are concave.

Hence, Both concave

Learn more :

Topic : focal length

https://brainly.in/question/6728576