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  2. Conoscopic interference pattern - Wikipedia

    en.wikipedia.org/wiki/Conoscopic_interference...

    The optic sign and optic angle can be determined together by combining interference pattern microscopy with use of a sensitive tint plate. On either side of the "saddle" formed by the isogyres, birefringent rings of colour run concentrically around two eye like shapes called melatopes. The closest bands are circles, but further out they become ...

  3. Topaz - Wikipedia

    en.wikipedia.org/wiki/Topaz

    Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]

  4. 2V - Wikipedia

    en.wikipedia.org/wiki/2V

    2V or 2-V may refer to: 2V, IATA code for Amtrak; 2V angle, curved isogyre differences in a conoscopic interference pattern in optical crystallography; P-2V, a model of Lockheed P-2 Neptune; An-2V, a model of Antonov An-2; 2V (V-69), manufacturer's designation for Venera 5 spacecraft; 2VLY, call sign for Power FM 98.1

  5. Optical ring resonators - Wikipedia

    en.wikipedia.org/wiki/Optical_ring_resonators

    A computer-simulated ring resonator depicting continuous wave input at resonance. An optical ring resonator is a set of waveguides in which at least one is a closed loop coupled to some sort of light input and output. (These can be, but are not limited to being, waveguides.)

  6. Pleochroism - Wikipedia

    en.wikipedia.org/wiki/Pleochroism

    The direction of the electric field determines the polarization of light, and crystals will respond in different ways if this angle is changed. These kinds of crystals have one or two optical axes. If absorption of light varies with the angle relative to the optical axis in a crystal then pleochroism results.

  7. Optical mineralogy - Wikipedia

    en.wikipedia.org/wiki/Optical_mineralogy

    A petrographic microscope, which is an optical microscope fitted with cross-polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis. Optical mineralogy is the study of minerals and rocks by measuring their optical properties.

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