First slide

The optical instruments

Question

In a compound microscope, the focal lengths of two lenses are 1.5 cm and 6.25 cm an object is placed at 2 cm form objective and the final image is formed at 25 cm from eye lens. The distance between the two lenses is

Moderate

A

6.00 cm
B

7.75 cm
C

9.25 cm
D

11.00 cm

Solution

$L = v_{o} + u_{e} = \frac{u_{o} f_{o}}{(u_{o} - f_{o})} + \frac{f_{e} D}{f_{e} + D}$
$\Rightarrow L = \frac{2 \times 1 .5}{(2 - 1 .5)} + \frac{6 .25 \times 25}{(6 .25 + 25)} = 11 cm$

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