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A person can see clearly only up to a distance of 30 cm. He wants to read a book placed at a distance of 50 cm from his eyes. What is the power of the lens he requires for his spectacles?

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answer is -1.33.

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Detailed Solution

The person is myopic. This defect is corrected by using a concave lens. Putting u=−50cm and v=−30cm in the lens formula 1v−1u=1f gives f=−75cm. Therefore, the power of the lens = -1.33 D.

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