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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 aphotoelectric 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. The photoelectric current in this case is

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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 aphotoelectric 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. The photoelectric current in this case is






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