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Light, Mirrors, Lenses Study Guide Reflecting telescopes use a concave mirror instead of an objective lens to gather light from a distant object. If white light were shone through a blue filter, blue light would pass through. Light waves do not need a medium to travel through. The image in a convex mirror is always upright, and is smaller than the object. Yellow, magenta and cyan are primary pigment colors. Lasers can be used for different types of surgery. Reflecting telescopes use curved mirrors to form images. If light waves change speed when they pass from one medium into another, the light will be refracted. The primary colors of light are red, blue, and green. When light strikes a transparent material, most of the light goes through it. A magnifying glass is a convex lens. A convex lens is thick in the middle and thin at the edges The image formed by a plane mirror is upright and reversed Waxed paper and frosted glass are examples of translucent material. An optical fiber can make a light beam travel in a path that is curved or twisted. A concave lens is a diverging lens. A light ray is one narrow beam of light traveling in a straight line. Glass is an example of a transparent material If an object looks red, it reflects red light When all the primary colors are mixed together you see white light. convex mirror Concave lense plane mirror Convex lens concave mirror