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  •  Eye piece of an astronomical telescope has focal length of .If angular magnification

 Eye piece of an astronomical telescope has focal length of 5 \mathrm{~cm}.If angular magnification in normal adjustment is 10 , then dustance between eye piece and objective should be

Option: 1

15 \mathrm{~cm}


Option: 2

35 \mathrm{~cm}


Option: 3

55 \mathrm{~cm}


Option: 4

75 \mathrm{~cm}


Answers (1)

best_answer

In normal adjustment, \mathrm{\quad L=f_{0}+f_{e}}

\mathrm{\text { and } M=\frac{f_{0}}{f_{e}} \text { or } 10=\frac{f_{0}}{5} \Rightarrow f_{0}=50 \mathrm{~cm} }
\mathrm{\therefore L=5 \mathrm{~cm}+50 \mathrm{~cm}=55 \mathrm{~cm}}.

Posted by

vishal kumar

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