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        A planocovex lens, when silvered in the plane side, behaves like a concave mirror of focal length 30cm. When it is silvered on the convex side,it behaves like a concave mirror of focal length 10 cm. The refractive index of the material of the lens is
2 years ago

Arun
24740 Points
							Dear Abhinay1/F = 2/f + 1/f(m)Plano-convex lens silvered on plane side has f(m) = infinity1/F = 2/f + 1/ infinity1/F = 2/ff = 30*2 = 60 cmPlano-convex lens silvered on convex side has f(m) = R/21/F = 2/f + 2/ R1/10 = 2/60 + 2/RR = 30 cmNow1/f = (\mu – 1)* Rif we put all value \mu = 1.5RegardsArun (askIITians forum expert)

2 years ago
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