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 Jarmels. Former Jarmels member Ray Orta was also called in as a fill-in replacement for Joe Rivera. On December 12, 2017, J.T. Carter's Crests performed at The Paramount Theatre in Asbury Park, New Jersey, along with over 40 other groups from the 1950s and '60s, as part of TJ Lubinsky's new PBS TV Special, "Doo Wop Generations" (part of the "My Music" series). The special aired nationally in the US on PBS on March 3, 2018. The group was featured singing "The Angels Listened In" on the PBS television broadcast, as well as "Step By Step" listed on the CD/DVD