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  1. Optical microscope. The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.

  2. Light sheet fluorescence microscopy ( LSFM) is a fluorescence microscopy technique with an intermediate-to-high [1] optical resolution, but good optical sectioning capabilities and high speed. In contrast to epifluorescence microscopy only a thin slice (usually a few hundred nanometers to a few micrometers) of the sample is illuminated ...

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  5. These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.

  6. en.wikipedia.org › wiki › MicrometreMicrometre - Wikipedia

    The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, [1] and for grading wool by the diameter of the fibres. [3] The width of a single human hair ranges from approximately 20 to 200 μm .

  7. en.wikipedia.org › wiki › AuroraAurora - Wikipedia

    An aurora [a] ( pl. aurorae or auroras ), [b] also commonly known as the northern lights ( aurora borealis) or southern lights ( aurora australis ), [c] is a natural light display in Earth 's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic ).

  8. Wikipedia is written by volunteer editors and hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other volunteer projects : Commons. Free media repository. MediaWiki. Wiki software development.