CSEC Physics · January 2009 · Paper 2 · Question 4(b)(iii)

Figure 3 shows a ray of light entering a rectangular glass block ABCD of refractive index 1.5. The angle of incidence is 60°.

If the critical angle for glass is 42°, describe what would happen to the ray if its angle of incidence on boundary BC was 42.5°.

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