Question

A reflecting type telescope has a large concave spherical mirror of radius of curvature `80 cm` as objective. What is the magnifying power of telescope if eye piece used has a focal length of `1.6 cm` ?

Answer 1

Here, `R = 80 cm`
`f_(0) = R//2 = (80)/(2) = 40 cm`
`f_(e) = 1.6 cm, m = ?`
`m = (f_(0))/(f_(e)) = (40)/(1.6) = 25`