A screen is placed 90 cm from an object The image of the object on the screen is formed - Physics - Ray Optics And Optical Instruments

Question

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 positions
separated by 20 cm Determine the focal length of the lens?

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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 positions separated by 20 cm. Determine the focal length of the lens?