Question

Sunlight of intensity is incident normally on a thin convex lens of focal length . Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in , at a distance from the lens on the other side is _____.

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Correct option is A)



Ratio of area
Let energy incident on lense be E.
Given
To calculate: final

Also
Average intensity of light at

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