Physics · May / June 2020 · Paper 11 · Question 26

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 of sin i against sin r: straight line through origin with steep positive gradient
2. Bgraph of sin i against sin r: straight line with negative gradient crossing sin i axis at 1.0
3. Cgraph of sin i against sin r: straight line with negative gradient crossing sin r axis at 1.0
4. Dgraph of sin i against sin r: straight line through origin with shallow positive gradient

As printed in the paper