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Distance of an object from the first focus of an equiconvex lens is 10 cm and the distance of its reimage from second focus is 40 cm. The focal length

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Distance of an object from the first focus of an equiconvex lens is 10 cm and the distance of its reimage from second focus is 40 cm. The focal length the lens is
A. 25 cm
B. 10 cm
C. 20 cm
D. 40 cm
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Correct Answer - C
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