In a ray diagram for reflection, what is the normal?
A line drawn along the surface at the point where the ray hits it
A line drawn at 45∘45^\circ45∘ to the surface at the point where the ray hits it
A line drawn along the path that the reflected ray is going to follow
A line drawn at right angles to the surface where the ray hits it
40 exam-style questions on AQA GCSE Physics 6.1 Waves in air, fluids and solids, covering 6.1.1 Transverse and longitudinal waves, 6.1.2 Properties of waves, 6.1.3 Reflection of waves, 6.1.4 Sound waves (HT only), and 6.1.5 Waves for detection and exploration (HT only). Each one has a worked solution and a mark scheme showing where the marks go.