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  2. Microlens - Wikipedia

    en.wikipedia.org/wiki/Microlens

    A microlens array used in a spectrograph. A microlens is a small lens, generally with a diameter less than a millimetre (mm) and often as small as 10 micrometres (μm). The small sizes of the lenses means that a simple design can give good optical quality but sometimes unwanted effects arise due to optical diffraction at the small features.

  3. Aspheric lens - Wikipedia

    en.wikipedia.org/wiki/Aspheric_lens

    Cross section of the Schmidt corrector plate, a common aspheric lens. Small glass or plastic aspheric lenses can be made by molding, which allows cheap mass production. Due to their low cost and good performance, molded aspheres are commonly used in inexpensive consumer cameras, camera phones, and CD players. [1]

  4. Pendant light - Wikipedia

    en.wikipedia.org/wiki/Pendant_light

    Poul Henningsen, PH Lamp, 1927: pendant lamp whereby the light was emitted indirectly. A pendant light, sometimes called a drop or suspender, is a lone light fixture that hangs from the ceiling usually suspended by a cord, chain, or metal rod. [1] Pendant lights are often used in multiples, hung in a straight line over kitchen countertops and ...

  5. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Crude relationship between lens size and its thickness for the same radius of curvature. In addition to its smaller surface area, the small lens is also much thinner and so is much lighter. The greatest cosmetic improvement on lens thickness (and weight) benefits from choosing a frame that holds physically small lenses.

  6. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    The collimator lens has the lower focal length and is placed closer to the light source, and the collector lens, which focuses the light into the triplet lens, is placed after the projection image (an active matrix LCD panel in LCD projectors). Fresnel lenses are also used as collimators in overhead projectors.

  7. Detroit River Light - Wikipedia

    en.wikipedia.org/wiki/Detroit_River_Light

    The Detroit River Light replaced a Canadian lightship that had been posted in this channel location since 1875, guiding upbound vessels making a turn in the Detroit River. The United States Lighthouse Board completed the Detroit River Light in 1885 at a cost of $78,000. The light was first lit on August 20, 1885. [11]

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