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A double convex lens has power P and sam...

A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of carvature of a surface of plano-convex lens made of the same meterial with power 1.5 P is :

A

2R

B

`R/2`

C

`(3R)/2`

D

`R/3`

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Knowledge Check

  • 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`

  • 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 power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is

    A
    `3/2`
    B
    `4/3`
    C
    `9/8`
    D
    `5/3`

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