Question

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

Answer 1

The image formed by the objective acts as an image for the eyepiece.The distance of the eyepiece is so adjusted that the objective's image lies within its focal length.The eyepiece magnifies this image so that the final image is magnified and inverted with respect to the object

Answer 2

Answer:

Magnifying power of an astronomical telescope is given by

M=−(f0(1+fe/d))/fe

∴ Two conditions for large magnification are ,

(i) focal length of objective lens f0 should be large

(ii) focal length of eye lens fe should be small.

Hope this helps .