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  3. a screen is placed 90 cm away from an object an im

A screen is placed 90 cm away from an object An image of the object...

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A screen is placed 90 cm away from an object An image of the object is formed on the screen by the same convex lens placed at two different locations separated by 30 cm The focal length of the lens is A 15 cm B 20 cm C 25 cm

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