Question

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?

Answer 1

To see the final image at D = 25 cm

For eye lens

\(u=-f\) and \(v=-25\) cm

\(m=\frac{v}{u}\)

\(10=\frac{-25}{-f}\)

f = 2.5 cm = 0.025 m

power of the lens = \(\frac{1}{f}=\frac{1}{0.025}=+40D\)