TUSAALE — Milicsiga iftiinka muraayadaha

Light travelling in one direction (along a ray) that hits a mirror reflects (bounces off the mirror) in one direction. The ‘normal’ is an imaginary line drawn at 90° to the point of reflection. The angles of incidence and reflection are measured to the normal. The angle of reflection is always equal to the angle of incidence, the other side of the normal. On a graph, a line of best fit highlights the main pattern of the data, ignoring small errors.