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
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a
i / 2
b
i /4
c
i / 8
d
i / 16
answer is D.
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Detailed Solution
we know that i∝D2/f2i1i2=D1D22×f2f1=(2)2×(2)2 or i2=i1/16
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