TBR LIGHT AND OPTICS EX. 10.4 a

[crazy person]

For this problem, since n1 is 1.333 is greater than n2 which is 1.0003, shouldn't there be an internal reflection ray and not a refracted light ray???

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[DrknoSDN]

In your example if the incidence ray is more than 48 degrees from normal it will be total internal reflection.
Just rearrange: n1 sin(t) = n2 sin(t)
The angle of the incidence ray will determine if there is internal reflection.