oscillate - move to and fro about a certain position along a line, reflection - is when light bounces off an object., refraction - the change of direction of a light ray when it passes across a boundary between two transparent substances (including air), angle of incidence - angle between an incident light ray and the normal, used in refraction and reflection, angle of reflection - angle between a reflected light ray and the normal, echo - reflection of sound that can be heard, opaque - a material that does not let light pass through, luminous - objects we see because they off light, Non-luminous objects - objects we see because they reflect light, Shadow - the region behind an object where light cannot reach, waves - disturbance that travels through space or a medium, which can carry energy or information, ray - line showing the path followed by light, rarefaction - stretched apart, Law of reflection - Angle of incidence = Angle of reflection, incident ray - ray of light striking a surface, before it is reflected or refracted,

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