In some design of eyeglasses , the surface is “aspheric” meaning that the countour varies slightly from sperical . An aspheric lense is often used to correct for sperical aberration − a distortiondue to increased refraction of light rays when they strike the lense near its edge . Aspheric lense are often designed with hyperbolic cross sections.
Write an equation of the cross sections of the hyperbolic lens showen if the center is (0, 0), one vertex is (2, 0), and the focal length (distance between center and foci) is
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