In 1888, Heinrich Hertz, a German physicist, constructed the world's first principle of parabolic reflectors has been known since classical antiquity, when the mathematician Diocles described them in his book On Burning Mirrors and proved that they focus a parallel beam to a point.
Heinrich Hertz constructed the world's first principle of parabolic reflectors has been known since classical antiquity. This was in 1888. Heinrich Hertz is a German physicist. The mathematician Diocles described them in his book On Burning Mirrors. They focus a parallel beam to a point. The mathematician Diocles proved this.