A plano-convex lens of focal length 40cm and refractive index =1.5 is silvered at plane surface. (a) What will be its focal length in air ? (b) What will be the equivalent mirror behave like ? (c ) What will be its focal length when it is silvered at curved surface instead of being silvered at the plane surface ?

A plano-convex lens of focal length 40cm and refractive index =1.5 is

1.	A plano-convex lens of focal length 40cm and refractive index =1.5 is silvered at plane surface. (a) What will be its focal length in air ? (b) What will be the equivalent mirror behave like ? (c ) What will be its focal length when it is silvered at curved surface instead of being silvered at the plane surface ?
Answer» Answer :(a) 20cm ; (B) CONCAVE MIRROR ; (C ) 20/3cm

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