1.

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»

(a) R=50cm f=? 

We know that

 f=R/2 = 50/2 = 25 cm 

(b) Convex mirror 

(c) It will diverge light rays.



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