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An optical apparatus which produces an intermittent light. *a. by an optical system producing pencil beams which revolve about a vertical axis.

1. The operation of placing a point object at the focus of an optical apparatus. ...operation of placing a light source about or near the focus of an optical apparatus in such a way as to produce a desired light distribution.

Light issuing from a source or optical apparatus in undesired directions. [[Category:2.2 Optical Apparatus]]

{{languages|Optical Glass}} [[Category:2.2 Optical Apparatus]]

...tem light emitted by the light source in directions other than that of the optical system, so as to increase the luminous intensity or the angle of divergence [[Category:2.2 Optical Apparatus]]

The property of those optical elements which alter the direction of a light ray from its original directi [[Category:2.2 Optical Apparatus]]

Optical Axis (of a lens, other than a fixed lens, or of a focusing reflector) {{languages|Optical Axis}}

Glass (or plastic) formed into the shape required for optical purposes by allowing it to solidify from the molten state in a suitably sha [[Category:2.2 Optical Apparatus]]

The horizontal plane through the focus of the optical apparatus of the light. [[Category:2.2 Optical Apparatus]]

A lens (in sense 2 of 2-2-010) in which the optical elements are assembled in a common supporting frame. [[Category:2.2 Optical Apparatus]]

The property of those optical elements which alter the direction of a light ray from its original directi [[Category:2.2 Optical Apparatus]]

The cross-section of the lens by a given plane containing the optical axis (2-2-110). [[Category:2.2 Optical Apparatus]]

...convex in section, the optical axis (2-2-110) of which coincides with the optical axis of the prismatic lens of which it forms a part. [[Category:2.2 Optical Apparatus]]

The plane normal to the optical axis of the lens or reflector and containing the focus. [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

...ric (2-2-060) and catadioptric (2-2-070) rings, usually forming part of an optical panel or a drum lens. [[Category:2.2 Optical Apparatus]]

An assembly of one or more optical panels revolving about a vertical axis, and intended to produce a flashing [[Category:2.2 Optical Apparatus]]

Glass formed, after solidification, into the shape required for optical purposes by cutting roughly to shape initially and subsequently shaping acc [[Category:2.2 Optical Apparatus]]

The property of those optical elements which alter the direction of a light ray from its original directi [[Category:2.2 Optical Apparatus]]

A transparent optical element of prismatic section, having plane or curved faces, placed in the p [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

A prismatic lens obtained by the rotation of a Fresnel profile about the optical axis of the lens (Fresnel Panel), or about a vertical axis (Fresnel Drum Le [[Category:2.2 Optical Apparatus]]

...ismatic lens obtained by the rotation of an equi-angular profile about the optical axis of the lens. In such a lens, the bullseye and rings usually present a [[Category:2.2 Optical Apparatus]]

...source placed at the focus of the paraboloid are rendered parallel to the optical axis (2-2-110) after reflection. [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

Note: In France, the subtense angle of an optical panel, measured in the horizontal plane, is called Ouverture. In Germany, the subtense angle of a fixed lens or of an optical panel, measured in the horizontal plane, is called Spannwinkel.

{{languages|Optical Panel}} [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

2. Frequently used in a more general sense for an assembly of optical elements which have a common focus. For examples, see 2-2-085, 2-2-090, 2-2 [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

...house practice, the term is also used for a cross-section of a transparent optical element bounded by three straight or slightly curved sides, approximating t [[Category:2.2 Optical Apparatus]]

A transparent optical element, usually of glass or plastic, bounded by at least two planes inters [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

An optical apparatus consisting of a light source and optically refracting or reflecting element [[Category:2.2 Optical Apparatus]]

...lens or reflector between the focus and (in practice) the point where the optical axis intersects the nearer surface of the lens or reflector. [[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]

[[Category:2.2 Optical Apparatus]]