Optics - the study of light and of instruments using light, Light - the form of energy that makes it possible to see things, Wave - the form that some types of energy such as heat, sound, light, etc. take as they move, Corpuscular - of, pertaining to, or composed of particles, Ray - a narrow line of light, heat or other energy, Reflection - the production of an image by or as if by a mirror, Refraction - the change in direction of a wave passing from one medium to another caused by its change in speed, Geometrical - characterized by or decorated with regular lines and shapes, Propagation - a term used to describe the way waves travel or move,

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