First slide

Ray optics

Question

If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is

Moderate

A

150
B

200
C

250
D

400

Solution

$\frac{1}{f_{0}} = \frac{1}{v_{0}} + \frac{1}{u_{0}} \Rightarrow \frac{1}{1.2} = \frac{1}{v_{0}} + \frac{1}{1.25}$
$∴ v_{0} = 30 cm$
$m = \frac{v_{0}}{u_{0}} . \frac{D}{fe} = \frac{30}{1.25} x \frac{25}{3} = 200$

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