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The near vision of an average person is ...

The near vision of an average person is `25 cm`. To view an object with an angular magnification of `10`, what should be the power of the microscope ?

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Here, `d = 25 cm, m = 10, P = ?`
Angular magnification, `m = (d)/(f) :. f = (d)/(m) = (25)/(10) = 2.5 cm P = (100)/(f) = (100)/(2.5) = 40 D`
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