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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: -2 : 1`

B

`-1 : 2: 1`

C

`-2:1:1`

D

`1:2:-1`

Text Solution

Verified by Experts

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
    act as a convex lens only for the objects that lie on its curved side.
    B
    act as a concave lens for the objects that lie on its curved side.
    C
    act as a convex lens irrespective of the side on which the object lies.
    D
    act as a concave lens irrespective of side on which the object lies.

  • The radius curvature of each surface of a convex lens of refractive index 1.5 is 40 cm. Calculate its power.

    A
    `2.5 D`
    B
    `2 D`
    C
    `1.5 D`
    D
    `1 D`