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What is the required radius of curvature for manufacturing a double-convex lens from a glass with a refractive index of 1.55, such that its focal length is 20 cm?

Options

  1. A18 cm
  2. B20 cm
  3. C22 cm
  4. D24 cm

Correct answer

C. 22 cm

Step-by-step solution

Correct Option is : (C) 22 cm

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