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An object 1m tall is placed on the principal axis of a convex lens and its 40cm tall image is formed

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An object 1m tall is placed on the principal axis of a convex lens and its 40cm tall image is formed on the screen placed at a distance of 70 cm from the object. What is the focal length of the lens?

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Since, the image is formed on the screen, so the image is real and inverted,

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