Question

When a telescope is adjusted for parallel light, the distance of the objective from the eye piece is found to be `80 cm`. The magnifying power of the telescope is 19 . The focal length of the lenses are
A. `61 cm, 19 cm`
B. `40 cm, 40 cm`
C. `76 cm, 4 cm`
D. `50cm, 30 cm`

Answer 1

Correct Answer - C
`f_(o)+f_(e)=80` and `(f_(o))/(f_(e))=19impliesf_(o)=76` and `f_(e)=4cm`