Angle of incidence - the angle made by a light ray arriving at a surface, measured from the normal, angle of reflection - the angle made by a reflected light ray on leaving a surface, measured from the normal, angle of refraction - the angle made by a ray of light that has bent at a surface, measured from the normal., incident ray - a bean of light arriving at a surface, law of reflection - the statement that the angle of reflection is equal to the angle of incidence, normal - in a ray diagram, this is a line drawn at 90 degree to a surface from which the angles of light rays are measured, perpendicular - at 90 degree, plane mirror - a flat, shiny surface designed to reflect light and produce clear reflected images., protractor - a tool for measuring angles, Rays - the paths of light, ray diagram - a way of showing the path taken by light using straight lines, reflection - when light bounces off a surface without being absorbed, refraction - a change in the direction of light caused by a change in the speed of the light when passing from one medium into another,

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