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The Word Association Thread


dave5282
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Repitition

Cambridge Advanced Learner's Dictionary

Repitition was not found

Did you spell it correctly?

Repetition ???

repeating

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Corolla ( He drives an old banger that doesn't always work :D )

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Obscurer

:bookworm: :lol2: :lol2: :lol2: :yahoo:

This article is about a photographic device. For other uses, see Camera obscura (disambiguation).

Camera obscura box.jpg

The camera obscura (Latin; "camera" is a "vaulted chamber/room" + "obscura" means "dark"= "darkened chamber/room") is an optical device that projects an image of its surroundings on a screen. It is used in drawing and for entertainment, and was one of the inventions that led to photography. The device consists of a box or room with a hole in one side. Light from an external scene passes through the hole and strikes a surface inside where it is reproduced, upside-down, but with colour and perspective preserved. The image can be projected onto paper, and can then be traced to produce a highly accurate representation.

Using mirrors, as in the 18th century overhead version (illustrated in the Discovery and Origins section below), it is possible to project a right-side-up image. Another more portable type is a box with an angled mirror projecting onto tracing paper placed on the glass top, the image being upright as viewed from the back.

As a pinhole is made smaller, the image gets sharper, but the projected image becomes dimmer. With too small a pinhole the sharpness again becomes worse due to diffraction. Some practical camera obscuras use a lens rather than a pinhole because it allows a larger aperture, giving a usable brightness while maintaining focus. (See pinhole camera for construction information

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:yawn::laughing:

Can't let im away with it. He must learn from his errors :lol: He hits me - I hit him...twice as hard :boxing: "An eye for an eye, a tooth for a tooth" :thumbsup:

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