A convex lens has focal length 30cm- If an object is placed a distance of 15cm from it then the magnification produced by the lens is-

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A convex lens has focal length $30$ cm. If an object is placed at a distance of $15$ cm from it then the magnification produced by the lens is?

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A convex lens has focal length 30cm. If an object is placed at a distance of 15cm from it then the magnification produced by the lens is?

A convex lens has focal length $30$ cm. If an object is placed at a distance of $15$ cm from it then the magnification produced by the lens is?