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The parabolic reflector functions due to the geometric properties of the paraboloid shape: if the angle of incidence to the inner surface of the collector equals the angle of reflection, then any incoming ray that is parallel to the axis of the dish will be reflected to a central point, or " focus". Because many types of energy can be reflected in this way, parabolic reflectors can be used to collect and concentrate energy entering the relector at a particular angle. Similarly, energy radiating from the "focus" to the dish can be transmitted outward in a beam that is parallel to the axis of the dish.
Isaac Newton introduced parabolic mirrors into practical astronomy when he invented the reflecting telescope. The most common applications of the parabolic reflector are in satellite dishes, telescopes (including radio telescopes), parabolic microphones and many lighting devices such as spotlights, car headlightsA headlight or headlamp is a light, usually attached to the front of a vehicle such as a car, with the purpose of illuminating the road ahead during periods of low visibility, such as night or precipitation. Modern headlights are electric floodlights, pos and LED housings.The Olympic FlameCincinnati, Ohio, U. on the way to the 2002 Winter Olympics in Salt Lake City, Utah. The Olympic Flame or Olympic Fire is a symbol of the Olympic Games. Commemorating the theft of fire from the Greek god Zeus by Prometheus, its origins lie in ancient Gree is lit using a parabolic reflector concentrating sunlight.
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