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Q. An object 60 cm tall is placed on the principal axis of a convex lens and its 30 cm tall image is formed on the screen placed at a distance of 40 cm from the object. What isthe focal length of the lens?

Answer» Q. An object 60 cm tall is placed on the principal axis of a convex lens and its 30 cm tall image is formed on the screen placed at a distance of 40 cm from the object. What isthe focal length of the lens?


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