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Which has more power, a thick concave le...

Which has more power, a thick concave lens or a thin convex lens, made of the same glass? Give reason for your choice.

Text Solution

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Thick convex lens, It has shorter focal length.
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Draw ray diagrams to represent the nature, position and relative size of the lens for the object placed: a) at 2F_(1) , b) between F_(1) and the optical center O of the lens. Which of the above two cases shows the use of convex lens as a magnifying glass? Give reasons for your choice.

What is the sign of the power of (i) a convex lens (ii) a concave lens ?

Knowledge Check

  • A plano-convex lens is made of flint glass, its focal length is

    A
    inversely proportional to the wavelength of light
    B
    longer for red than for blue
    C
    longer for blue than for red
    D
    the same for all colour

  • A plano - convex lens is made of flint glass. Its focal length is

    A
    inversely proportional to the wavelength of light
    B
    longer for red than for blue
    C
    longer for blue than for red
    D
    the same for all colours

  • When a thin convex lens is put in contact with a thin concave lens of the same focal length (f), then the resultant combination has focal length equal to

    A
    f/2
    B
    2f
    C
    0
    D
    `oo`

    • Similar Questions

    Explore conceptually related problems

    A convex lens is known as a converging lens. Give reason.

    A concave lens is called a diverging lens. Give Reason

    A beam of parallel rays is brought to a focus by a plano convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is

    A comvex lens and a concave lens are placed in contact. The ratio of magnitude of the power of the convex lens to that of the concave lens is 4:3. If the focal length of the convex lens is 12 cm, then the focal length of the combination will be

    Assertion:A convex lens and a concave lens are kept in contact. They will behave as a diverging lens if focal length of convex lens is more. Reason: Power of a concave lens is always less than the power of a convex lens, as power of concave lens is negative whereas power of convex lens is positive.

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