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Q.

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

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a

61 cm, 19 cm

b

40 cm, 40 cm

c

76 cm,  4 cm

d

50 cm, 30 cm

answer is C.

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Detailed Solution

f0+fe=80 and f0fe=19⇒fo=76 and fe=4cm
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