The shiny outer surface of a hollow sphere of aluminium of radius 60cm 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.
(a) R=60cm
f=?
We know that
f=R/2 = 60/2 = 30 cm
(b) It will provide convex mirror
(c) diverge light rays.