Physics · May / June 2020 · Paper 12 · Question 32

Light enters a glass block at an angle of incidence i and it produces an angle of refraction r in the glass. Several different values of i and r are measured, and a graph is drawn of sin i against sin r. Which graph is correct?

1. AGraph A: straight line through origin with positive gradient
2. BGraph B: straight line with negative gradient from sin i = 1.0 at sin r = 0 to sin i = 0 at sin r = 0.5
3. CGraph C: straight line with negative gradient from sin i = 0.6 at sin r = 0 to sin i = 0 at sin r = 1.0
4. DGraph D: straight line through origin with positive gradient

As printed in the paper