Questions
The focal length of the objective of a terrestrial telescope is 80 cm and it is adjusted for normal vision to produce a magnification of 20. If the focal length of erecting lens is 20cm, then full length of telescope tube will be ___
a
84cm
b
100cm
c
124 cm
d
164 cm
detailed solution
Correct option is D
For normal vision,fofe = m ⇒ 80fe = 20 ⇒ fe = 4cm ∴ L = fo+4f+fe = 80+4×20+4cm = 164cmTalk to our academic expert!
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