First slide

Ray optics

Question

In a terrestrial telescope the focal length of erecting lens is 2 cm. The length of the telescope is 96 cm. If the magnifying power of the telescope is 10, then the focal lengths of eye piece and objective are respectively

Moderate

A

8 cm, 80 cm
B

96/11 cm, 960/11 cm
C

6 cm, 90 cm
D

92/11 cm , 920/11 cm

Solution

$t o t a l l e n g t h o f a t e r r e s t r i a l t e l e s c o p e i s f_{0} + 4 f + f_{e} = 96 c m f = 2 c m f_{0} + f_{e} = 88 c m m a g n i f i c a t i o n \frac{f_{0}}{f_{e}} = 10$

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