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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 ?

Text Solution

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Let f be the focal length of the microscope. Then, angular magnification is
`m=(D)/(f)`
where D is the least distance of distinct vision = 25 cm
`rArr" "f=(D)/(m)=(25)/(10)=2.5cm`
`therefore" Power"=(100)/(f)=(100)/(2.5)=40D`
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