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AP EAMCET202317 May 2023Evening ShiftPhysicsRay OpticsActual

The radius of curvature of a convex lens is 40 ~cm , for each surface. Its refractive index is 1.5 . Its focal length is

Options

  1. A40 ~cm
  2. B20 ~cm
  3. C80 ~cm
  4. D30 ~cm

Correct answer

A. 40 ~cm

Step-by-step solution

From the formula aligned & 1 f =( -1) ( 1 R ₁ - 1 R ₂ ) & 1 f =(1.5-1) ( 2 40 )= 1 40 aligned focal length, f=40 ~cm

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