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

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

 

Answers (1)

In the given question, the least distance of distinct vision of an average person is 25 cm, in order to view an object with magnification 10,

Here,

v=D=25\; cm\; and\; u=f

But the magnification

m=\frac{v}{u}=\frac{D}{f}

\Rightarrow f=\frac{D}{m}=\frac{25}{10}=2.5 \; cm=0.025\; m

But power

P=\frac{1}{f(in\; m)}=\frac{1}{0.025}=40\; D

This is the required power of the lens.

 

Posted by

infoexpert23

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