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A man is placed 20 cm to the left of a concave lens of focal length...

A man is placed 20 cm to the left of a concave lens of focal length 20 cm. If a convex lens is   placed 50 cm to the right of the first lens, the screen must be placed 60 cm to the right of the convex lens for a sharp image of the man be formed on it. What is the focal length of the convex lens?

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