Q285 A screen is placed 90 cm from an object The image of the object...

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Q285 A screen is placed 90 cm from an object The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm The focal length of the lens is 1 18 81 cm 2 20 04 cm 3 13 01 cm 4 21 39 cm 1 2 3 4 We see that your answer is incorrect Please

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