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Three diagrams are given each has equal ...

Three diagrams are given each has equal radial of curvature of the curved surfaces. All the lenses have refractive index `mu=1.5`.

The ratio of focal lengths of P,Q,R is

A

`1:1:1`

B

`-1:2:1`

C

`-2:1:1`

D

`1:2:-1`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The radius of curvature of the curved surface of a plano-convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will

    A
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