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Glossary of Optics Terms
beginning with letter R
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Raman effect Tweet Definition of Raman effect Like Definition of Raman effect on Facebook
noun 
  1. (physics) the inelastic scattering of photons with subsequent change in frequency and phase; employed in Raman spectroscopy
     
real Tweet Definition of real Like Definition of real on Facebook
noun 
  1. A commodity; see reality.
  2. (grammar) One of the three genders that the common gender can be separated into in the Scandinavian languages.
adjective (er, more)
  1. That can be characterized as a confirmation of truth.
  2. That has physical existence.
No one has ever seen a real unicorn because they don't exist.
  1. (economics) Having been adjusted to remove the effects of inflation; contrasted with nominal.
real consumption
real GNP
  1. (economics) Relating to the result of the actions of rational agents; relating to neoclassical economic models as opposed to Keynesian models.
  2. (mathematics) Relating to numbers with a one-to-one correspondence to the points on a line.
  3. Relating to immovable tangible property.
real estate
real property
  1. That is an exemplary or pungent instance of a class or type.
a real problem
a real hero
  1. Genuine, not faked.
real tears
  1. Genuine, not artificial.
real leather
  1. (slang) Signifying meritorious qualities or actions especially in regards to enjoying life, prowess at sports and success wooing potential partners.
keeping it real
adverb 
  1. (colloquial) really.
     
reflect Tweet Definition of reflect Like Definition of reflect on Facebook
verb 
  1. (transitive) To bend back (light etc) from a surface.
    • A mirror reflects the light that shines on it.
      1. (transitive) To mirror, or show the image of something.
    • The shop window reflected his image as he walked past.
      1. (transitive) To bring as a consequence.
    • The team's victory reflects the Captain's abilities.
      1. (intransitive) To be bent back.
    • The laser light was reflected from the spaceman's visor.
      1. (intransitive) To give evidence of someone's or something's character etc.
    • The teacher's ability reflects well on the school.
      1. (intransitive) To think seriously; to ponder or consider.
    • People do that sort of thing every day, without ever stopping to on the consequences.
     
reflectometer Tweet Definition of reflectometer Like Definition of reflectometer on Facebook
noun 
  1. an instrument used to measure the reflectance of a surface
     
reflector Tweet Definition of reflector Like Definition of reflector on Facebook
noun 
  1. Something which reflects heat, light or sound, especially something having a reflecting surface.
  2. A reflecting telescope.
  3. A small, often red, reflecting disk on the rear of a vehicle that reflects the headlights of other vehicles.
     
refract Tweet Definition of refract Like Definition of refract on Facebook
verb 
  1. (context, intransitive, of light) To change direction as a result of entering a different medium
  2. (transitive) To cause (light) to change direction as a result of entering a diffrent medium.
A prism can light.
     
refractive index Tweet Definition of refractive index Like Definition of refractive index on Facebook
noun 
  1. (physics) the ratio of the speed of light in air or vacuum to that in another medium
     
refractometer Tweet Definition of refractometer Like Definition of refractometer on Facebook
noun 
  1. (physics) An optical instrument used to measure the refractive index of a substance
     
resolution Tweet Definition of resolution Like Definition of resolution on Facebook
noun 
  1. The state of being resolute.
His stalwart resolution is perhaps admirable, perhaps foolish.
  1. A statement of intent, a vow (often New Year's resolution).
My resolution is to cut back on the fast food this year.
  1. The act of discerning detail.
  2. (computing) The degree of fineness with which an image can be recorded or produced, often expressed as the number of pixels per unit of length (typically an inch).
Printing at higher resolution will cause a reduction in performance.
  1. (context, computer hardware) The number of pixels in an image that are stored or displayed.
This monitor's maximum resolution is 800x600.
  1. A formal statement adopted by an assembly.
  2. (science) The separation of the constituent parts (of a spectrum etc).
  3. (science) The degree of fineness of such a separation.
  4. (music) Progression from dissonance to consonance; a chord to which such progression is made.
     
resolving power Tweet Definition of resolving power Like Definition of resolving power on Facebook
noun 
  1. a quantitative measure of the ability of an optical instrument to produce separable images
     
reticle Tweet Definition of reticle Like Definition of reticle on Facebook
noun 
  1. (obsolete) a small net
  2. a gridwork or lattice of lines set into the eyepiece of optical instruments to help with measurements or observation
     
reticule Tweet Definition of reticule Like Definition of reticule on Facebook
noun 
  1. A reticle; a grid, network, or crosshatch, especially as found in the eyepiece of various optical instruments to aid measurement or alignment.
    1. A small women's bag made of a woven net-like material.
    • 2006, Thomas Pynchon, Against the Day, Vintage 2007, p. 606:
    • :Pléiade ... lingered through another bottle of wine before producing from her a Vacheron & Constantin watch
     

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