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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 variety of purposes. It can be employed to focus sunlight, harnessing the Sun's rays to create a concentrated hot ...
Because of their thin, narrow frames, you can treat these readers almost like bifocals—if you have otherwise-fine eyesight, they’re easy to peer over. They also come in a wide range of ...
The magnification of the eyepiece depends upon its focal length and is calculated by the same equation as that of a magnifying glass (above). Note that both astronomical telescopes as well as simple microscopes produce an inverted image, thus the equation for the magnification of a telescope or microscope is often given with a minus sign .
The magnifying power V of a simple magnifying glass is related to its optical power φ by V = 0.25 m × φ + 1 {\displaystyle V=0.25\ \mathrm {m} \times \varphi +1} . This is approximately the magnification observed when a person with normal vision holds the magnifying glass close to his or her eye.
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A photographic loupe for examining film and prints. A loupe (/ ˈluːp / LOOP) is a simple, small magnification device used to see small details more closely. [1] They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye. A loupe does not have an attached handle, and its focusing lens ...
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