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Derive lens formula for a concave lens....

Derive lens formula for a concave lens.

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Knowledge Check

  • The lens formula is

    A
    `(1)/(f) = (1)/(v) + (1)/(u)`
    B
    `(1)/(f) = (1)/(v) - (1)/(u)`
    C
    `(1)/(f) - (1)/(v) = (1)/(u)`
    D
    ( d) `(1)/(f) - (1)/(u) = (1)/(v)`

  • 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.

    A
    If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
    C
    If both Assertion is true, but the Reason is false.
    D
    If both Assertion is false but the Reason is true.

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    Derive lens maker's formula for a thin convex lens.

    What is a concave lens ?

    State used of a concave lens.

    State uses of a concave lens.

    State two differences between a convex lens and a concave lens. Give one use of convex lens and one of concave lens.

    Distinguish between a convex lens and a concave lens.

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