Optics a telescope of aperture 0.05m

read these pages, these will help you to understand from where these formulas come.. sorry for my mistake, sometimes we also do mistake because by using wrong formula we get the an...

this is the correct solution..

as in solution u not using value of distance 50m

solution is here

i think here we need to obtain resolving power not theta

mam i obtained the same but answer is given 6.1×10^-4

i'm attaching solution as well as theory associated with telescope.