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AP EAMCET20224 Jul 2022Evening ShiftPhysicsRay OpticsActual

The radii of curvature of a double convex lens are 4 cm and 8 cm . If the refractive index of the material of the lens is 1 . 5 , the focal length of the lens is nearly

Options

  1. A16   cm
  2. B12 . 11   cm
  3. C7 . 33   cm
  4. D5 . 33   cm

Correct answer

D. 5 . 33   cm

Step-by-step solution

From Lens maker's formula, 1 f = μ 2 μ 1 - 1 1 R 1 - 1 R 2 ⇒ 1 f = 1 . 5 1 - 1 1 0 . 04 - 1 - 0 . 08 ⇒ f = 5 . 33   cm

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