CSEC Physics · May/June 2008 · Paper 2 · Question 5(b)(ii)

Figure 4 shows a ray of light, XY, incident on a right-angled prism, PQR, of refractive index 1.5. The point of incidence on PR is such that the refracted ray inside the prism is incident on PQ.

Given that the critical angle for the glass-air boundary, PQ, is 41.8°, deduce whether or not there would be total internal reflection at this boundary.

This question uses a figure or table from the paper — you'll see it when you practise.