achromatic

Definitions

  • Achromatic Lens
    Achromatic Lens
  • WordNet 3.6
    • adj achromatic having no hue "neutral colors like black or white"
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Webster's Revised Unabridged Dictionary
    • Achromatic (Opt) Free from color; transmitting light without decomposing it into its primary colors.
    • Achromatic (Biol) Uncolored; not absorbing color from a fluid; -- said of tissue.
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Century Dictionary and Cyclopedia
    • achromatic Destitute of color; free from coloration; transmitting light without decomposing it into its constituent colors: as, an achromatic lens or telescope.
    • achromatic In biology: Colorless; hyaline. Difficult to stain: a term applied to the portion of the cell-nucleus which exhibits little or no tendency to stain in carmine, hæmatoxylin, or certain aniline dyes used in histologic and cytologic technic.
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Chambers's Twentieth Century Dictionary
    • adj Achromatic a-krōm-at′ik transmitting light without colour, of a lens or telescope
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Etymology

Webster's Revised Unabridged Dictionary
Gr. colorless; 'a priv. + , , color: cf. F. achromatique,
Chambers's Twentieth Century Dictionary
Gr. a, neg., and chrōma, chromatos, colour.

Usage

In literature:

PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 219, January 7, 1854" by Various
Within seventeen days of its identification with the Berlin achromatic, Neptune was found to be attended by a satellite.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 193, July 9, 1853" by Various
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 194, July 16, 1853" by Various
ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris.
"Notes and Queries, Number 195, July 23, 1853" by Various
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 218, December 31, 1853" by Various
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 217, December 24, 1853" by Various
On Some Properties in Achromatic Object Glasses Applicable to the Improvement of the Microscope, in Phil.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams
PORTRAIT LENSES of double Achromatic combination, from 1l.
"Notes and Queries, Number 216, December 17, 1853" by Various
A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
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In news:

The achromatic tone is available in a variety of hues and looks great in just about every room in the house.
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In science:

Remarkably, the microlensed afterglow may have been already observed in the light curve of GRB 000301C as the achromatic bump (Garnavich, Loeb & Stanek 2000; Gaudi, Granot & Loeb 2001; but see also Panaitescu 2001).
Microlensing of collimated Gamma-Ray Burst afterglows
If the edge of the image crosses the lens before the break time, the microlensing signal appears as an achromatic amplification peak in the light curve (Loeb & Perna 1998).
Microlensing of collimated Gamma-Ray Burst afterglows
N∗ is the number of stars monitored for a duration Tobs , and ǫ(tE ) is the overall detection efficiency for events with timescale tE .2 Finally, when blending is negligible or is due to a star with the same colour as that being microlensed, microlensing is achromatic.
The Galactic Halo from Microlensing
The resulting light curve is symmetric about t0 , and achromatic (i.e. has the same shape in every wavelength).
Stars and singularities: Stellar phenomena near a massive black hole
Now consider the typical microlensing event; although the lens is achromatic, from equation (20) we see that the amplitude of the closure phase signal is inversely proportional to the cube of the wavelength.
Bringing closure to microlensing mass measurement
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