The objective of a telescope has a diameter 5 cm. What is the angular seperation in radius of two starts which can be resolved by the telescope when light of $3000 A^{\circ}$ is used.

Question

$(a)\;7.32 \times 10^{-6} \\ (b)\;6.02 \times 10^{-6} \\ (c)\;7.12 \times 10^{-6} \\ (d)\;5.12 \times 10^{-6}$