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Radius of curvature =………x focal length....

Radius of curvature =………x focal length.

A

3

B

4

C

2

D

5

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Knowledge Check

  • The refractive index of a material of a plano concave lens is 5//3 the radius of curvature is 0.3m. The focal length of the lens in air is

    A
    `-0.45 m`
    B
    `-0.6m`
    C
    `-0.75m`
    D
    `-1.0m`

  • A convex lens has its radii of curvature equal. The focal length of the lens is f. If it is divided vertically into two identical plano-convex lenses by cutting it, then the focal length of the plano-convex lens (p = the refractive index of the material of the lens)

    A
    f
    B
    `f/2`
    C
    2f
    D
    `(mu-1)f`

  • The refractive index of a material of a plano-concave lens is 5/3 , the radius of curvature is 0.3 m. The focal length of the lens in air is

    A
    -0.45 m
    B
    -0.45 m
    C
    -0.75 m
    D
    -1.0 m

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    Define focal length and radius of curvature of a concave lens.

    Define focal length and radius of curvature of a concave lens.

    What is focal length ?

    Two equi-convex lenses, each of radius of curvature 20 cm and refractive index 1.5 are placed in contact. If water of refractive index 4/3 is placed in between the lenses, the focal length of the combination is,

    Two equi-convex lenses, each of radius of curvature 20 cm and refractive index 1.5 are placed in contact. If water of refractive index 4/3 is placed in between the lenses, the focal length of the combination is,

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