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The Eye of the World is a high fantasy novel by American writer Robert Jordan, the first book of The Wheel of Time series. It was published by Tor Books and released on 15 January 1990. The original unabridged audiobook is read by Michael Kramer and Kate Reading .
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A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye. A telescope , which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image closely with a smaller eyepiece lens, thus making the ...
The eye can then be a larger distance away, and a good image can be obtained very easily; the focus is not very sensitive to the eye's exact position. The magnifying power in this case is roughly MP = (0.25 m)Φ. A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres. Such a magnifier ...
For instance, using a magnifying glass of 5 cm focal length, held 20 cm from the eye and 5 cm from the object, produces a virtual image at infinity of infinite linear size: M = ∞. But the angular magnification is 5, meaning that the object appears 5 times larger to the eye than without the lens.
The Mapparium was designed to allow the countries of the world to be viewed in accurate geographical relationship to each other, hence the design of the Mapparium—a mirror-image, concave reversal of the Earth, viewed from within. This is the only configuration that places the eye at the same distance from every point on the globe.
It has been proposed that glass eye covers in hieroglyphs from the Old Kingdom of Egypt (c. 2686–2181 BCE) were functional simple glass meniscus lenses. [40] The so-called Nimrud lens, a rock crystal artifact dated to the 7th century BCE, might have been used as a magnifying glass, although it could have simply been a decoration. [41] [42 ...