Sun rays are focussed on a photo-sensitive plate with the help of convex lens. The photo-electric current is found to be i. If the lens is replaced by another similar lens of half the diameter and double the focal-length, the photo-current will now be

Sun rays are focussed on a photo-sensitive plate with the help of convex lens. The photo-electric current is found to be i. If the lens is replaced by another similar lens of half the diameter and double the focal-length, the photo-current will now be

  1. A

    i / 2

  2. B

    i /4

  3. C

    i / 8

  4. D

    i / 16

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    Solution:

    we know that iD2/f2
    i1i2=D1D22×f2f1=(2)2×(2)2 or i2=i1/16

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