| 释义 |
Nicol2 Optics.|ˈnɪkəl|
Also nicol.
[The name of the inventor, William Nicol of Edinburgh (died 1851).]
A prism of Iceland spar, so constructed as to transmit only the extraordinary ray of doubly refracted light. (Also freq. called Nicol prism.)
1843Phil. Mag. XXII. 243, I find it a most material improvement to substitute a Nicol prism for the plate of glass. 1863E. Atkinson tr. Ganot's Elem. Treat. Physics vii. viii. 485 The Nicol's prism is one of the most valuable means of polarising light. 1875Tyndall Heat xv. (ed. 5) 517 The construction of the Nicol is such that it permits to pass through it vibrations which are executed in a certain determinate direction, and these only. 1878Lockyer Stargazing 448 If two Nicols are used instead of two simple crystals. 1906Jrnl. Chem. Soc. LXXXIX. ii. 1150 The nicols were rotated. 1937Discovery Aug. 242/2 A Nicol prism (which is two portions of a rhomb of Iceland spar cemented together with Canada balsam). 1955W. Gaddis Recognitions iii. v. 874 If we can fix a microscope up with polarized light and put a particle of the pigment under it, we can see whether it's isotropic or anisotropic, for that we use nicol prisms. |