When waves reach a boundary between one medium (material) and another they can be reflected, refracted, absorbed, or transmitted. - This can be remembered with the acronym RRAT
What is used to show what happens when waves reach a boundary between one medium and another?
Raydiagrams
When waves are reflected at a surface the angle of incidence is equal to the angle of reflection
When constructing a ray diagram : Rays must be drawn with a ruler - Each straight section of ray should have a single arrow drawn on it to indicate the direction of movement - Where the ray meets the boundary, a 'normal' should be drawn at right-angles to the boundary - All relevant angles should be labelled
