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2. Parabolic reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_reflector

   A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid , that is, the surface generated by a parabola revolving around its axis.

3. List of telescope parts and construction - Wikipedia

   en.wikipedia.org/wiki/List_of_telescope_parts...

   Parabolic reflector; Subsequent (sometimes optional) components realign, segment, or in some way modify the light of an incoming image: Field lens: A correcting lens placed just before the image plane of a telescope. [citation needed]

4. Cape Don Light - Wikipedia

   en.wikipedia.org/wiki/Cape_Don_Light

   The apparatus installed consists of four vertical panels, each consisting of four 300-millimetre (12 in) rear surfaced parabolic reflectors. The lamps are 12-volt 36-watt quartz halogen lamps, electrically connected in pairs 180° apart.

5. Parabolic loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Parabolic_loudspeaker

   The parabolic reflector of the Holophones system emits plane waves. [12] [13] Each unit of the Holophones system consists of a parabolic dish with a limited band loudspeaker at its focal point, with controllable radiation angle. The dynamic controls for sculpturing the wavefront are managed by a computer.

6. Stage lighting instrument - Wikipedia

   en.wikipedia.org/wiki/Stage_lighting_instrument

   It uses two reflectors. The primary reflector is a parabolic reflector and the secondary reflector is a spherical reflector. The parabolic reflector directs the light into nearly parallel beams, and the spherical reflector is placed in front of the lamp to reflect light from the lamp back to the parabolic reflector, which reduces spill.

7. Parabolic aluminized reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_aluminized_reflector

   The size of a round PAR lamp is expressed as the nominal diameter of the mouth of the reflector, in eighths of an inch—so the approximate nominal lamp bell diameter in inches can be found by dividing the PAR size by 8. A PAR56, for example, is 56 eighths of an inch (7 inches) in diameter; a PAR36 is 36 eighths (4.5 inches) in diameter, and so on.