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Class 12
PHYSICS
In the figure shown the radius of curvat...

In the figure shown the radius of curvature of the left `&` right surface of the concave lens are `10cm` & `15 cm` respectively. The radius of curvature of the mirror is `15 cm` . equivalent focal length of the combination is

A

the system behaves like a convex mirror of focal length `18 cm`

B

the system behaves like a concave mirror of focal length `18 cm`

C

the system behaves like a convex mirror of focal length `36 cm`

D

the system behaves like a concave mirror of focal length `36 cm`

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Text Solution

Verified by Experts

The correct Answer is:
B
N//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.

  • What is the refractive index of material of a plano-convex lens , if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm ?

    A
    `6/5`
    B
    `7/4`
    C
    `2/3`
    D
    `4/3`

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