Question

A Galileo telescope has an objective of focal length $100cm$ and magnifying power $50$. The distance between the two lenses in adjustment will be

• A. $96cm$
• B. $98cm$
• C. $102cm$
• D. $104cm$

Answer 1

The correct option is B $98cm$

By using $m=\frac{f_o}{f_e}\Rightarrow f_e=\frac{100}{50}=2cm$
Also $L=f_o-f_e=100-2=98cm$