1.

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

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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 distane of 50 cm from his eyes. What is the power of the lens he requires for his spectacles?



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