Questions
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
detailed solution
Correct option is D
we know that i∝D2/f2i1i2=D1D22×f2f1=(2)2×(2)2 or i2=i1/16Talk to our academic expert!
Similar Questions
Image of the sun is formed by a binconvex lens of focal length f. The image is a circular patch of radius r and is formed on the focal plane of the lens. Choose the correct statement from the following
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