b) The angle of incidence, of the ray, on striking the face AC is
i = 60° (as from figure).
Total internal reflection will only take place when the angle of incidence i is greater than critical angle ic.
We know that condition for total internal reflection is
Where μ is the relative refractive index of glass, with respect to the surrounding water. Therefore ,
Since ic is greater than the incident angle i, total internal reflection will not take place.
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