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Convex lens : Positive power :: Co...

Convex lens : Positive power :: Concave lens ………….

Text Solution

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Negative power : The power of concave lens is negative as the power depends on focal length.
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Concave lens : Negative focal length :: convex lens …………..

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Knowledge Check

  • Magnification of a concave lens is ……………..

    A
    positive
    B
    negative
    C
    either positive nagative
    D
    zero

  • A convex lens does not produce:

    A
    real magnified image
    B
    virtual magnified image
    C
    virtual diminished image
    D
    real diminished image

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    Convex lens: Converging :: Concave lens: ………….

    Convex lens of power +5" D " and concave lens with power -3" D " are placed together, then the combined power is ………………..

    Write the uses of concave lens.

    (i) A convex lens of power +6D and a concave lens of power -4D are combined together. Find the power of the combination of two lenses.

    The power of concave lens is __________.

    A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm . Find the power of concave lens.

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