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A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is

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A double convex lens is made of glass of refractive index 1.55 with both faces of same radius of curvature. Find the radius of curvature required, if focal length is 20 cm .

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Knowledge Check

  • A convex-concave diverging lens is made of glass of refractive index 1.5 and focal length 24 cm. radius of curvature for one surface is double that of the other. Then radii of curvature for the two surfaces are (in cm )

    A
    6,12
    B
    12,24
    C
    3,6
    D
    18,36

  • A convexo-concave convergent lens is made of glass of refractive index 1.5 and focal length 24 cm. Radius of curvature for one surface is double than that of the other. Then,radii of curvature for the two surfaces are (in cm)

    A
    `6,12`
    B
    `12,24`
    C
    `3,6`
    D
    `18,36`

  • A plano-convex lens is made of glass of refractive index 1.6. the radius of curvature of its curved surface is 30 cm. What is the focal length of the lens ?

    A
    50 cm
    B
    75 cm
    C
    100 cm
    D
    150 cm

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    A double convex lens made of glass refractive index 1.6 has its both surfaces of equal radii of curvature of 30 cm each. An object of 5 cm height is placed at a distance of 12.5 cm from the lens. Find the position, nature and size of the image.

    A plane convex lens has a focal length 12cm and is made up of glass with refractive index 1.5. Find the radius of curvature of its curved side.

    A plano-convex lens is made of glass of refractive index 1.5. the radius of curvature of its convex surface is R. its focal length is

    A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R. Its focal length is

    A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

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