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The radius of curvature of a thin plno-convex lens is 10 cm (of curved surface) and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be
  • a)
    15 cm
  • b)
    20 cm
  • c)
    5 cm
  • d)
    10 cm
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The radius of curvature of a thin plno-convex lens is 10 cm (of curved...
The lens with silvering on the plane surface will behave as a concave mirror of radius of curvature R = 20 cm. Hence, its focal length is 
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