A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be
Text Solution
Verified by ExpertsThe correct answer is:
D
Here 
Plano-convex lens silvered on plane side has 
Plane-convex lens silvered on convex side has 
Now using focal length formula for plane-conver lens, we get
, we get 
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