Question

With regard to an astronomical telescope for refracting type, state how you will increase its :
(i) magnifying power.
(ii) resolving power.

Answer 1

(i) In order to increase the magnifying power of a telescope the focal length $f_0$ of the objective lens should be large and focal length $f_0$ of the eyepiece should be small.
(ii) Larger the aperture of the objective lens, smaller the limit of resolution or greater the resolving power of the telescope.