The figure shows graph between incident angle and refracted angle for two cases. case 1: when light travels from material 1 to air and case 2: when light travels from material 2 to air. The refractive index of material 1 and material 2 are

Question

$(a)\;\sqrt 2,\frac {1}{\sqrt 2} \\ (b)\;\frac {1}{2}, \sqrt 2 \\ (c)\;\sqrt 3,\frac {2}{\sqrt 3} \\ (d)\;\sqrt 2,\frac {2}{\sqrt 3}$