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A thin plano convex lens made of glass of refractive index 1.5 is immersed in a liquid of refractive index 1.2. When the plane side of the lens is silver coated for complete reflection, the lens immersed in the liquid behaves like a concave mirror of focal length 0.2 m . The radius of curvature of the curved surface of the lens is

Options

  1. A0.20 m
  2. B0.25 m
  3. C0.15 m
  4. D0.10 m

Correct answer

D. 0.10 m

Step-by-step solution

aligned & 1.5 v = 1.5-1.2 R & v = 1.5 R 0.3 =5 R & 1.2 f - 1.5 5 R = 1.2-1.5 - R & 1.2 f = 0.3 R 2 f =2 R R =0.1 aligned

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