A biconvex lens made of glass (µ g = 1.5) has radius of curvature 
. It is kept in contact with a plane mirror. Find magnitude of power of optical device formed if space between them is filled with water (µ w = 4/3) in dioptre.
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Ans. 2
Sol.
focal length of convex mirror (f 1 ) = R m
focal length of concave lens (f 2 ) = – 3 R m
effective lens (f eq ) = 
= 
= 
= 1 m
= 
– 
= 
– 
f = 
P = – 2D
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