The diameter of objective lens of a telescope is 6 cm and wavelength of light used is

540 nm. What will be the resolving power of telescope?

Resolving power if telescope (RP) = 1/∆θ

= D/1.22 λ

= 6 x ${{10}^{-2}}$/1.22 x 540 x ${{10}^{-9}}$

= 9.1 x ${{10}^{4}}$ ${{rad}^{-1}}$