Question

The focal lengths of the eyepiece and the objective of a compoundmicroscope are 5 cm and 1 cm respecively and the length of the tube is 20 cm. CAlculate the magnifying power of the microscope when the final image is formed at infinity . The value of D is 25 cm.

Answer 1

Dear Student,

L=20 cm D=25 cm f₀=1 cm f_e=5 cm

FORMULA

$$\begin{gathered} MagnifyingPowerofacompundmicroscopeforimageformedatinfinity \\ M\approx -\frac{L}{f_0}\times \frac{D}{f_e} \\ \approx -\frac{20}{1}\times \frac{25}{5} \\ \approx -100 \end{gathered}$$

Regards.