Rayleigh distance Rayleigh distance Rayleigh distance in optics is the axial distance from a radiating aperture to a point at which the path difference between the axial ray and an edge ray is λ / 4. An approximation of the Rayleigh Distance is formula_1, in which Z is the Rayleigh distance, D is the aperture of radiation, λ the wavelength. This approximation can be derived as follows. Consider a right angled triangle with sides adjacent formula_2, opposite formula_3and hypotenuse formula_4. According to Pythagorean theorem, formula_5. Rearranging, and simplifying formula_6 The constant termformula_7 can be neglected. In antenna applications, the Rayleigh distance is
The Crests 24, 2014, at his home in Flint, Michigan. He was 74. The Crests were inducted into the United in Group Harmony Association (UGHA) Hall of Fame in 2000. The Crests were inducted into The Vocal Group Hall of Fame in 2004. The Crests were inducted into The Doo Wop Hall of Fame in 2008. The Crests were inducted into The Doo Wop Music Hall of Fame in 2015. On May 9, 2012, Johnny Maestro was honored by the House of Representatives of the United States of America. Congressman Jerrold Nadler of New York, whose district includes the neighborhood where Maestro