JEE Main 2013 Physics question

Light is incident from a medium into air at two possible angles of incidence (A) 20° and (B) 40°. In the medium light travels 3.0 cm in 0.2 ns. The ray will :

(1)suffer total internal reflection in both cases (A) and (B)
(2)suffer total internal reflection in case (B) onlyCorrect
(3)have partial reflection and partial transmission in case (B)
(4)have 100% transmission in case (A)

Answer: (2)

Solution

Speed in the medium m/s, so μ = 2 and the critical angle is

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Question ID VK-103918