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We wish to make a plano convex lens of f...

We wish to make a plano convex lens of focal length 16 cm from glass having refractive index 1.5. It is to be used in air. The radius of curvature of the curved surface is

A

8 cm

B

12 cm

C

16 cm

D

24 cm.

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A plano - convex lens has a focal length of 0.25 m and is made of glass of refractive index 1.5. Find the radius of curvature of its curved surface. If two such lenses are placed with their curved surfaces in contact then what will be the focal length of the combination? If the space between them is filled with a liquid of refractive index 1.7, what will be the focal length of the combination?

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Knowledge Check

  • Radius of curvature of a plano-convex lens of focal length 0.2 m made up of glass of refractive index 1.5 is :

    A
    0.2 m
    B
    0.1 m
    C
    2.5 m
    D
    0.4 m.

  • A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be

    A
    0.1m
    B
    0.75m
    C
    0.4m
    D
    0.2m

  • For an equiconvex lens of focal length f and refractive index 3/4 the radius of curvature of either face is equal to

    A
    `(3f)/2`
    B
    `(2f)/3`
    C
    f
    D
    `f/2`

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