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An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm and image of sun is again formed on the same metal plate. The photoelectric current in this case is

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0.5 I

2 I

answer is B.

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Detailed Solution

Since aperture is same in both cases, same no. of photons pass through lens producing same photo current.

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