Question

Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Answer 1

We have,

C = 32 cm

now if ,

F = C / 2 = 32 / 2 = 16 cm

Answer 2

In case of a concave mirror, all the rays coming from infinity converge at a point after getting reflected from the mirror.

This point is called the focus of the mirror.

The radius of curvature of a spherical mirror is 20 cm.

Answer:

We know, radius of curvature a spherical mirror  = 2 x focal length (f)\f=R÷2=20cm÷2=10cm,

Hence, focal length = 10 cm