Question

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?

Answer 1

Formula used: $m=\frac{+v}{u}$

Given that,

The final image at distinct vision,

𝐷=25 cm.

For eyes lens 𝑢=−𝑓 and 𝑣= −25

$m=\frac{+v}{u}$

$10=\frac{-25}{-f}$

$f=+\frac{25}{10}=+2.25cm=0.025m$

$p=\frac{1}{f}=\frac{1}{0.025}=\frac{1000}{25}=40D$

Final Answer: 40 D