A person with short sighted can read a book placed at 20cm away. To read the book at 25 cm away. He should use the lens of which nature and of what focal length in his spectacles
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Concave lens
f = -100
He should use a concave lens of -100 cm focal length to clearly read the book placed at 25 cm away.
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Answer:
f=-100cm then m=1.25 image nature virtual and erect by using concave lens
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