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2. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   Magnifying glass on an arm lamp. The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. The magnifying power is equivalent to angular magnification (this should not be confused with optical power, which is a different

3. 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 ...

4. 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.

5. Photographic lens design - Wikipedia

   en.wikipedia.org/wiki/Photographic_lens_design

   Diagram of Petzval's 1841 portrait lens - crown glass shaded pink, flint glass shaded blue The lenses of the very earliest cameras were simple meniscus or simple bi convex lenses. It was not until 1840 that Chevalier in France introduced the achromatic lens formed by cementing a crown glass bi-convex lens to a flint glass plano-concave lens.

6. We found 14 personalized gifts from Walmart that look more ...

   www.aol.com/lifestyle/we-found-14-personalized...

   A personalized travel mug is one of the most popular gifts to give, but take it to the next level with this personalized tumbler made of frosted glass with a wooden lid and plastic straw.

7. Megalethoscope - Wikipedia

   en.wikipedia.org/wiki/Megalethoscope

   The megalethoscope and the alethoscope are capable of a certain illusion of relief. Photographic views are seen enlarged through a wide, thick magnifying glass that creates an illusion of the subjects' plasticity, perspective depth and modelling. The instrument's arrangement minimises surrounding indicators of depth that would let us know this ...