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Q.

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

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a

using a prism in the path of light beam

b

using a thick glass sheet

c

tilting the cathode

d

changing the distance of light source from the emitter

answer is D.

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Detailed Solution

we know that in case of point source of radiation I∝1d2Hence by changing the distance of light source from emitter, we will change intensity
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While studying, effect of variation of intensity on the photocurrent,  intensity of light is changed in a photocell by