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While studying, effect of variation of intensity on the photocurrent, intensity of light is changed in a photocell by

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tilting the cathode

using a prism in the path of light beam

changing the distance of light source from the emitter

using a thick glass sheet

answer is D.

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Detailed Solution

We know that in case of point source of radiation intensity $I \propto \frac{1}{d^{2}}$
hence by changing the distance of light source from emitter, we will change intensity.

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