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A person can see clearly only upto a distance of 25cm He wants to read...

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A person can see clearly only upto a distance of 25cm He wants to read a book placed at a distance of 50cm Wha kind of lens does he required for his spectacles and what must be its power 1 concave 1 0 D 3 Concave 2 0 D 2 Convex 1 5 D 4 Convex 2 0 D for sighted ll hole 3 4 mm in oot

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