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Glossary of Optics Terms
beginning with letter L
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L Tweet Definition of L Like Definition of L on Facebook
noun
  1. (sports) The statistic for the number of losses by a team or player limited by some criteria (e.g. this season, at home, on turf)
  1. (alternative spelling of, el (elevated train))
    • 1925 February 21, "Co-operation" (cartoon), w:The New Yorker, The New Yorker, page 2,
    • :PLEASE! HELP US KEEP THE "" AND SUBWAY CLEAN
Lambert Tweet Definition of Lambert Like Definition of Lambert on Facebook
proper noun
  1. An English and Germanic surname derived from the words for land and bright
  2. A male given name transferred from the surname
  3. A lunar impact crater
(wikipedia, Lambert (lunar crater))      
lase Tweet Definition of lase Like Definition of lase on Facebook
verb (las, ing)
  1. To use a laser beam, as for cutting
The surgeon lased the elongated soft palate, cutting off the excess tissue and stopping the blood flow in one swipe.
The physical chemist lased the atoms as they passed between the electrodes to study their motion.
  1. To operate as a laser, to release coherent light due to stimulation. (See laser).
lasing Tweet Definition of lasing Like Definition of lasing on Facebook
verb
  1. Present participle of lase; using a laser beam
lens Tweet Definition of lens Like Definition of lens on Facebook
noun (plurallenses)
  1. An object, usually made of glass, that focuses or defocuses the light that passes through it.
  2. A device which focuses or defocuses electron beams.
  3. (geometry) A shape comprising two circular arcs, joined at their endpoints.
  4. (biology) A genus of the legume family.
  5. (anatomy) The transparent crystalline structure in the eye.
lumen Tweet Definition of lumen Like Definition of lumen on Facebook
noun (pl=lumens, pl2=lumina)
  1. (physics) In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm
  2. (anatomy) The cavity or channel within a tube or tubular organ.
  3. (botany) The cavity bounded by a plant cell wall.
  4. The bore of a tube such as a hollow needle or catheter.
luminance Tweet Definition of luminance Like Definition of luminance on Facebook
noun
  1. the quality of being luminous
  2. the luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs
luminescence Tweet Definition of luminescence Like Definition of luminescence on Facebook
noun
  1. (context, physics) Any emission of light that cannot be attributed merely to the temperature of the emitting body.
luminosity Tweet Definition of luminosity Like Definition of luminosity on Facebook
noun
  1. the state of being luminous, or a luminous object; brilliance or radiance
  2. the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
  1. (star) the rate at which a star radiates energy in all directions

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