(a) Show using a

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 i_c.

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