Question

05. Both a spherical
mirror and a thin spherical
lens have a focal length of
(+20cm). What type of
mirror and lens are these?​

Answer 1

Answer:

Both concave

Explanation:

By convention, the focal length of a concave mirror and a concave lens are taken as negative. Hence, both the spherical mirror and the thin spherical lens are concave in nature.

Answer 2

Explanation:

only concave lens can have a focal length of +20