If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective
If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective
A. 100 cm
B. 10 cm
C. 20 cm
D. 25 cm
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Correct Answer - C
(c ) Given, `f_(o)+f_(e)`=105
`f_(o)+f_(e)/20 = 105`
`f_(o)=100 cm`
`f_(o)+f_(e)=105 cmand f_(o/(f_(e))=20 cm`
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