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Large table-top viewer for vue d'optique prints. Late 18th century An example of a picture designed for viewing under a zograscope equipped with a mirror, its text written right-to-left. A zograscope is an optical device for magnifying flat pictures that also has the property of enhancing the sense of the depth shown in the picture
The non-magnified side has eight small LED lights, ideal for doing your makeup or diffusing the light while using the 3x magnification side. To use the LEDs, just flip a switch in the back and you ...
Exit pupil – Telescopic sights concentrate the light gathered by the objective into a beam, the exit pupil, whose diameter is the objective diameter divided by the magnifying power. For maximum effective light-gathering and brightest image, the exit pupil should equal the diameter of the fully dilated iris – for a youthful dark-adapted ...
Reading stone in Archeon, a historical theme park. A reading stone is an approximately hemispherical lens that can be placed over text to magnify the letters, making it easier for people with presbyopia to read. Reading stones were among the earliest common uses of lenses.
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.
Stratospheric Observatory for Infrared Astronomy 24-inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.
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