Eduprobe
Question:
A spherical mirror and a thin spherical lens have each a focal length of −15cm. The mirror and lens are likely to be:
the mirror is convex but lens is concave
both Convex
both concave
the mirror is concave and lens is convex
Solution:
The correct option is D both concave
Negative focal length is a characteristic of concave mirror and concave lens. Hence, both mirror and the lens are concave.