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KVPY2014PhysicsRay Optics

A concave lens made of material of refractive index 1.6 is immersed in a medium of refractive index 2.0 . The two surfaces of the concave lens have the same radius of curvature 0.2 ~m . The lens will behave as a

Options

  1. ADivergent lens of focal length 0.4 ~m
  2. BDivergent lens of focal length 0.5 ~m .
  3. CConvergent lens of focal length 0.4 ~m .
  4. DConvergent lens of focal length 0.5 ~m

Correct answer

D. Convergent lens of focal length 0.5 ~m

Step-by-step solution

1 F = ( 1.6 2 -1 ) ( 1 -0.2 - 1 0.2 )= 0.4 2 1 0.1 F=0.5 converging lens

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