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KCET2010PhysicsRay Optics

A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is 60 ~cm . The focal length of the lens is

Options

  1. A400 ~cm
  2. B200 ~cm
  3. C100 ~cm
  4. D50 ~cm

Correct answer

C. 100 ~cm

Step-by-step solution

Here, 1 f =( -1) [ 1 R ₁ - 1 R ₂ ] 1 f =(1.6-1) [ 1 60 - 1 ]= 1 100 f =100 ~cm

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