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  • If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of the objectiveOption: 1</stron

If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of the objective

Option: 1

100 \mathrm{~cm}


Option: 2

10 \mathrm{~cm}


Option: 3

20 \mathrm{~cm}


Option: 4

25 \mathrm{~cm}


Answers (1)

best_answer

\mathrm{L=f_{0}+f_{e}=105 \mathrm{~cm} \text { and } M=\frac{f_{0}}{f_{e}}=20}
\mathrm{\Rightarrow f_{0}=100 \mathrm{~cm} \text { and } f_{e}=5 \mathrm{~cm} }.

Posted by

seema garhwal

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