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  2. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    The Michel-Levy Chart (named after Auguste Michel-Lévy) arises when polarised white light is passed through a birefringent sample. If the sample is of uniform thickness, then only one specific wavelength will meet the condition described above, and be perpendicular to the direction of the analyser.

  3. Conoscopic interference pattern - Wikipedia

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

    A conoscopic interference pattern or interference figure is a pattern of birefringent colours crossed by dark bands (or isogyres), which can be produced using a geological petrographic microscope for the purposes of mineral identification and investigation of mineral optical and chemical properties.

  4. Auguste Michel-Lévy - Wikipedia

    en.wikipedia.org/wiki/Auguste_Michel-Lévy

    Michel-Lévy interference colour chart issued by Zeiss Microscopy Michel-Lévy pioneered the use of birefringence to identify minerals in thin section with a petrographic microscope . He is widely known for the Michel-Lévy interference colour chart , which defines the interference colors from different orders of birefringence.

  5. Polarized light microscopy - Wikipedia

    en.wikipedia.org/wiki/Polarized_light_microscopy

    Polarizing microscope operating principle Depiction of internal organs of a midge larva via birefringence and polarized light microscopy. Polarized light microscopy can mean any of a number of optical microscopy techniques involving polarized light. Simple techniques include illumination of the sample with polarized light.

  6. 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.

  7. Optical rotation - Wikipedia

    en.wikipedia.org/wiki/Optical_rotation

    Optical rotation, also known as polarization rotation or circular birefringence, is the rotation of the orientation of the plane of polarization about the optical axis of linearly polarized light as it travels through certain materials. Circular birefringence and circular dichroism are the manifestations of optical activity.

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