Question

The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror : (a) What will be the focal length of this mirror ? (b) Which type of spherical mirror will it provide ? (c) State whether this spherical mirror will diverge or converge light rays.

Answer 1

(a)
R=50cm
f=?

We know that

Focal length = 25cm

(b) Convex mirror(Because outer surface will be bulged out.)
(c) It will diverge light rays. Since it is a convex mirror