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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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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 bea)15 cmb)20 cmc)5 cmd)10 cmCorrect answer is option 'D'. Can you explain this answer?
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