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A convex lens produces an image of an object on a screen with a magnification of 1/2 . When the lens is moved 30 cm away from the away from the object, the magnification of the image is 2 . The Focal length of the lens is 

(1) 20 cm 

(2) 25 cm 

(3) 30 cm 

(4) 35 cm

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Best answer

Correct Option is (1) 20 cm

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