A plano convex lens behave as a concave mirror of focal length 30 cm when its plane surface is silvered and as a concave mirror of focal length 10 cm when its curved surface is silvered. The radius of curvature of curved surface in cm is ….. × 10 cm.
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Ans. 3
Sol.
= 
+ 
+ 
= 2 × 
× 
= 
= 
= 
= 
+ 
⇒ R = 30 cm
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