Parallel beam of monochromatic light of wavelength $\lambda =4800 \mathring{A}$ is incident on a single slit of size $0.2 mm$ . The angular divergence in which most of light is diffracted is [ie between two 1st order maxima on both sides]

Question

$(a)\;1.22 \times 10^{-3} \;rad \\ (b)\;2.4 \times 10^{-3} \;rad \\ (c)\;4.8 \times 10^{-3} \;rad \\ (d)\;2.4 \times 10^{-2} \;rad $