See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

For no. emergence of ray from AC; 2 C r , C  critical angle Also, r1 + r2 = 75  r2 = 75  r1  75  r1  45  r1 = 30 From snell’s law 1 2 sinr sin    1 sin 2 2     45  max 45 4     r1 r2 75 15  A B C