First slide

The optical instruments

Question

When a telescope is adjusted for parallel light, the distance of the objective from the eye piece is found to be 80 cm. The magnifying power of the telescope is 19. The focal lengths of the lenses are

Moderate

A

61 cm, 19 cm
B

40 cm, 40 cm
C

76 cm, 4 cm
D

50 cm, 30 cm

Solution

$f_{0} + f_{e} = 80 and \frac{f_{0}}{f_{e}} = 19 \Rightarrow f_{o} = 76 and f_{e} = 4 cm$

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