Angle of incidence, Angle between the normal and the incident ray., Angle of reflection, The angle between the reflected ray and the normal, Diffuse reflection, When light is reflected off a rough surface in all directions., Incident ray, Light ray moving towards a surface or boundary., Normal, Acting at an angle of 90° to a surface or boundary., Reflected ray, Light ray leaving a surface or boundary., Specular reflection, Reflection in which light travelling towards a surface in one direction is all reflected in a single direction..

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