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  2. Welding helmet - Wikipedia

    en.wikipedia.org/wiki/Welding_helmet

    Most welding helmets include a window covered with a filter called a lens shade, through which the welder can see to work. The window may be made of tinted glass, tinted plastic, or a variable-density filter made from a pair of polarized lenses. Different lens shades are needed for different welding processes.

  3. Welding inspection - Wikipedia

    en.wikipedia.org/wiki/Welding_inspection

    The evolution of welding technology has been driven by advancements in Weld quality assurance, welding codes, and standards for welding inspection. [11] While the origins of welding can be traced back to approximately 3000 B.C., the need for effective weld joint inspection became increasingly apparent during the late 19th and early 20th centuries, coinciding with the rise of industrialization ...

  4. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    The magnifying power in this case is roughly MP = d o Φ. [9] A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier would be sold as a "2×" magnifier. In actual use, an observer with "typical" eyes would obtain a magnifying power between 1 and 2, depending on where lens ...

  5. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    The postage stamp appears larger with the use of a magnifying glass. Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of something.

  6. Objective (optics) - Wikipedia

    en.wikipedia.org/wiki/Objective_(optics)

    One of the most important properties of microscope objectives is their magnification.The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.

  7. Ground glass - Wikipedia

    en.wikipedia.org/wiki/Ground_glass

    In motion-picture cameras, the ground glass is a small, usually removable piece of transparent glass that sits between the rotary disc shutter and the viewfinder. The ground glass usually contains precise markings to show the camera operator the boundaries of the frame or the center reticle, or any other important information. Because the ...

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