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Glossary of Optics Terms
beginning with letter E
Browse the Optics Glossary
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electron microscope
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noun
  1. Any of several forms of microscope that use a beam of electrons rather than one of light and thus has a much greater resolving power
element
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noun
  1. (chemistry) Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
  2. One of the four basic building blocks of matter in theories of ancient philosophers and alchemists: water, earth, fire, and air.
  3. Something small.
an of doubt
  1. A place or state of being that an individual or object is better suited towards.
be in one's own
  1. A required aspect or component of a cause of action. A deed is regarded a violation of law only if each element can be proved.
  2. (set theory) One of the objects in a set.
  3. A group of people within a larger group having a particular common characteristic.
You sometimes find the hooligan at football matches.
  1. A short form of heating element, a component in electrical equipment, often in the form of a coil, having a high resistance, thereby generating heat when a current is passed through it.
The in this electric kettle can heat the water in under a minute.
ellipsometer
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noun
  1. an instrument that uses polarized light to investigate the surface layers of semiconductor wafers etc. Used in ellipsometry.
Em
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proper noun
  1. Shortening of the given name Emily.
Auntie , Auntie ...
abbreviation
  1. exametre, exameter
epidiascope
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noun
  1. a machine that projects images onto a screen
equatorial
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adjective
  1. of, near, or relating to the equator
    That plant is best suited to climates.
erect
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verb (erects, erecting, erected)
  1. (transitive) To put up by the fitting together of materials or parts.
  2. (transitive) To cause to stand up or out.
adjective
  1. upright, Upright; vertical or reaching broadly upwards.
  2. rigid, Rigid, firm; standing out perpendicularly.
eyepiece
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noun
  1. The lens (or combination of lenses) at the eye end of a microscope or telescope by which the image is viewed
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