JEE Main & Advanced Sample Paper JEE Main Sample Paper-3

  • question_answer
    For the determination of the focal length of a convex mirror, a convex lens is required because

    A)  it is not possible to obtain the image produced by a convex mirror on the screen

    B)  a convex lens has high resolving power so it helps to measure the focal length correctly

    C)  a convex mirror always forms a real image which is diminished by the convex lens

    D)  none of these                           

    Correct Answer: A

    Solution :

     A convex mirror always forms a virtual image which can't be cast on a screen. Hence a convex lens is used to find the focal length of a convex mirror.


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