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A convex lens when placed in the first p...

A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position, again a real image is formed on the screen. Then the focal length of the lens is

A

25.0 cm

B

16.7 cm

C

50.3 cm

D

33.3 cm

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