Questions
The magnifying power of a telescope with tube length 60cm is 5. What is the focal length of its eye piece?
a
20cm
b
10cm
c
30cm
d
40cm
detailed solution
Correct option is B
Magnifying power =m=fofe ⇒ 5=fofe ⇒ fo=5fe Length of tube = fo+fe=60cm ⇒6fe=60 ⇒ fe=10 cmTalk to our academic expert!
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