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  2. Monocle - Wikipedia

    en.wikipedia.org/wiki/Monocle

    The dandy's quizzing glass of the 1790s was an article of high fashion, [1] which differs from the monocle in being held to one's eye with a handle in a fashion similar to a lorgnette, rather than being held in place by the eye socket itself.

  3. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...

  4. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    Binoculars concentrate the light gathered by the objective into a beam, of which the diameter, the exit pupil, is the objective diameter divided by the magnifying power. For maximum effective light-gathering and brightest image, and to maximize the sharpness, [27] the exit pupil should at least equal the diameter of the pupil of the human eye ...

  5. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    The maximum angular magnification (compared to the naked eye) of a magnifying glass depends on how the glass and the object are held, relative to the eye. If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular ...

  6. E-reader - Wikipedia

    en.wikipedia.org/wiki/E-reader

    Amazon's Kindle Keyboard e-reader displaying a page of an e-book. An e-reader, also called an e reader or e device, is a mobile electronic device that is designed primarily for the purpose of reading digital e-books and periodicals.

  7. Stereoscope - Wikipedia

    en.wikipedia.org/wiki/Stereoscope

    A more advanced multiple view stereoscope is only intended for glass slides and was especially popular in France, as the printing of stereo images on glass was a French specialty and popular until the 1930s. Most devices were manufactured in France, but also in Germany by ICA and Ernemann. The glass slides are placed in a bakelite or wooden tray.

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