COMEDK Exam 2016 Solved Paper

The critical angle between two media is given by
ic=sin‌−1(‌

µ1

µ2

)
As we know that, µ‌air ‌=1,µ‌water ‌=1.33,µ‌glass ‌=1.5 and µ‌diamond ‌=2.4.
From given values, ‌

µ1

µ2

is maximum for water-glass interface. So, critical angle will also be maximum, when light travels from glass to water.