40. एक आदमी 2.5 कि.मी. 10 मिनट में पूरा करता है। उसकी चाल किलोमीटर प्रति घंटा बताओ। ह
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An object is placed at a distance of 5 cm more than the focal length f of a convex lens. Its real image is formed at a distance 3 f beyond the focus. The focal length f of the lens is?
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