Question

An astronomical telescope has angular magnification m=7 for distant object. Distance between objective and eyepeice is 40 cm. final image is formed at infinitely focal length of objective and eyepeice respectively are
A. 35 cm, 5 cm
B. 28 cm, 14 cm
C. 5 cm, 35 cm
D. 70 cm, 10 cm

Answer 1

Correct Answer - A
`f_(0)+f_(e)=40`
`7=(f_(0))/(f_(e))impliesf_(0)=35cm`
`f_(e)=5cm`