Answer :

a)



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 ,



Therefore




Since ic is greater than the incident angle i, total internal reflection will not take place.


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