For a ray of light, the critical angle is minimum when it travels from

Step-by-step solution

c= 1 a _ w = 4 3 , a _ g = 3 2 , w _ g = a _ g a _ w = 9 8 Critical angle will be maximum when refractive index of the denser medium w.r.t. the rarer medium is minimum. w ₈= 9 8 is minimum