a) State the conditions for total internal reflection to occur.
b) A right angled prism of refractive index n has a plate of refractive index n1 so
that n1 < n, cemented to its diagonal face. The assembly is in air. A ray is
incident on AB.
i. Calculate the angle of incidence at AB for which the ray strikes the
diagonal face at the critical angle.
ii. Assuming n = 1.352, calculate the angle of incidence at AB for which
the refracted ray passes through the diagonal face undeviated.
