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When does a convex lens behave as a conc...

When does a convex lens behave as a concave lens ?

Text Solution

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When the convex lens is held in a transparent medium of refractive index greater than the refractive index of lens material, it would behave as a concave lens.
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Knowledge Check

  • 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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