A star is seen using a telescope whose objective lens has a diameter of 250 cm. The wavelength of light coming form the star is 500 nm. The limit of resolution of telescope is

2.4 × 10^–7 radians

Limit of resolution of telescope, \( d \theta=\frac{1.22 \lambda}{D} \)

\( d \theta=\frac{1.22 \times 500 \times 10^{-9}}{250 \times 10^{-2}} \)

dθ = 2.4 × 10^–7 radians