Questions
If the tube length of astronomical telescope is 105cm and magnifying power is 20 for normal setting, calculate the focal length of the objective lens
a
100 cm
b
10 cm
c
20 cm
d
25 cm
detailed solution
Correct option is A
L=f0+fe=105 cm and M=f0fe=20 ⇒f0=100 cm and fe=5 cmTalk to our academic expert!
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An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm. The focal length of objective is
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