State the condition under which a large magnification can be achieved in an astronomical telescope.

Explanation

Magnifying power of an astronomical telescope is
`M = (-f_0)/(f_e)(1 + (f_e)/(d))`
`:.` Two conditions for large magnification are ,
(i) focal length of objective lens `(f_0)` should be large
(ii) focal length of eye lens `(f_e)` should be small.