A lens - a transparent piece of glass or plastic with at least one curved surface, Refraction - physical phenomenon according to which light rays bend as they pass through the lens, so they change direction., Convex lens - a lens in which the glass or plastic surfaces bulge outwards in the center. It makes parallel light rays passing through it bend inward and meet at a spot just beyond the lens known as the focal point, A concave lens - a lens in which the outer surfaces curve inward, so it makes parallel light rays curve outward or diverge., Compound lens - a lens that uses two or more simpler lenses, Ray tracing - the technique of determining the paths light rays take for analysis of optical systems.,

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