Question

Four convergent lenses have focal lengths $100cm,10cm,4cm$ and $0.3cm$, for a telescope with maximum possible magnifications we choose the lenses of following focal lengths :

• A. $10cm,0.3cm$
• B. $10cm,4cm$
• C. $100cm,4cm$
• D. $100cm,0.3cm$

Answer 1

The correct option is D $100cm,0.3cm$

$m=\frac{f_0}{f_e}$
so $f_0=100,f_e=0.3cm$
for getting maximum magnification.