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Glossary of Optics Terms
beginning with letter H
Browse the Optics Glossary
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heliogram Tweet Definition of heliogram Like Definition of heliogram on Facebook
noun
  1. A message transmitted by a heliograph.
heliograph Tweet Definition of heliograph Like Definition of heliograph on Facebook
noun
  1. An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
  2. A heliogram.
  3. An instrument for measuring the intensity of sunlight.
  4. A device for photographing the sun.
  5. (obsolete) A photograph.
verb
  1. (transitive) To send a message by heliograph.
  2. (intransitive) To send a heliograph.
helioscope Tweet Definition of helioscope Like Definition of helioscope on Facebook
noun
  1. An apparatus for viewing the sun without injuring the eye
heliostat Tweet Definition of heliostat Like Definition of heliostat on Facebook
noun
  1. A device, consisting of a mirror turned by clockwork, to reflect the light of the sun in some fixed direction; now used with some measuring device to continuously monitor the sun's output
hologram Tweet Definition of hologram Like Definition of hologram on Facebook
noun
  1. A three dimensional image; unlike regular images which are usually two dimensional, a three dimensional image or hologram, appears to "pop out" of the media which it is printed on or illuminated from. Hologram images are usually created by using a single laser beam which is split and splashed onto the object and finally onto the film.
holograph Tweet Definition of holograph Like Definition of holograph on Facebook
noun
  1. A hologram.
  2. A handwritten document, especially a letter, deed, or will, that is solely the work of the person whose signature it bears; a manuscript.
holography Tweet Definition of holography Like Definition of holography on Facebook
noun
  1. (physics) a technique for recording, and then reconstructing, the amplitude and phase distributions of a coherent wave disturbance; used to produce three-dimensional images or holograms
hue Tweet Definition of hue Like Definition of hue on Facebook
noun (plural:hues)
  1. Color or shade of color; tint; dye.
livid with the hue of death
::— Wikipedia:Mary W. Shelley, Mary W. Shelley
  1. Character; aspect.
  2. The characteristic related to the light frequency that appears in the color; It can be, from lower to higher wave frequencies, respectively: red, yellow, green, Cyan or blue. In digital arts, in HSV color, it's used together with saturation and value.
hydroscope Tweet Definition of hydroscope Like Definition of hydroscope on Facebook
noun
  1. A device for viewing objects below the surface of the water.

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