Since, μ= 1.5, Critial angle = sin–1(1/μ) = sin–1 (1/1.5) = 41.8°
We know, the maximum attainable deviation in refraction is (90° – 41.8°) = 47.2°
So, in this case, total internal reflection must have taken place. In reflection, Deviation = 180° – 2i = 90° => 2i = 90° => i = 45°.
