Multiple Choice Questions on If the focal length of the biconvex lens is 25 cm then the power of the lens will be ........ for General Studies (Level 1) Preparation

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Multiple Choice Questions

If the focal length of the biconvex lens is 25 cm then the power of the lens will be ........

General Science (Easy) Physics
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    If the focal length of the biconvex lens is 25 cm, then the power of the lens will be

    + 4 dioptre

    Correct Answer

    – 4 dioptre

    Incorrect Answer

    + 0.04 dioptre

    Incorrect Answer

    – 0.04 dioptre

    Incorrect Answer
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    Explanation:

    + 4 dioptre

    Given:-
    P=1/f   f=25cm=0.25m

    P=1/0.251?=4D

    Since, it is a convex lens, the power is positive. Thus, P=+4D

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