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AP EAMCET2007PhysicsRay Optics

The refractive index of the material of a double convex lens is 1.5 and its focal length is 5 ~cm . If the radii of curvature are equal, the value of the radius of curvature (in cm ) is

Options

  1. A5.0
  2. B6.5
  3. C8.0
  4. D9.5

Correct answer

A. 5.0

Step-by-step solution

1 f =( -1) ( 1 R₁ - 1 R₂ ) For double convex lens, R₁=R, R₂=-R aligned & 1 5 =(1.5-1) ( 1 R + 1 R ) & or 1 5 =0.5 2 R & or R=5 ~cm & aligned

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