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A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 'em in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is

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A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 'em in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is






 
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