Q.

The magnifying power of a telescope with tube length 60cm is 5. What is the focal length of its eye piece?

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a

20cm

b

10cm

c

30cm

d

40cm

answer is B.

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Detailed Solution

Magnifying power =m=fofe            ​⇒  5=fofe          ​⇒ fo=5fe Length of tube = fo+fe=60cm        ​⇒6fe=60       ​⇒ fe=10 cm
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