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The radii of curvature of the faces of a double convex lens are 10 cm and 20 cm . The refractive index of the glass is 1.5 . What is the power of this lens (in units of dioptre)?

Options

  1. A+7.5 D
  2. B-7.5 D
  3. C+2.5 D
  4. D+5.0 D

Correct answer

A. +7.5 D

Step-by-step solution

The correct answer is option A.

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