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(a) A 40-year-old professor requires eye...

(a) A `40`-year-old professor requires eyeglasses with lenses of `2D` power to read a book at `25cm`. What is his near point?
(b) After `10` years he finds that while wearing same specks he must hold the book `40cm` from his eyes. What is his near point now, what power lens does he require now to read a book again at `25cm`?

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