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Homemade light tent for taking pictures with a diffused lighting from all sides. A light tent, a kind of photography light modifier, is a box used for taking photos of objects without casting shadows. It can, for example, be used to take pictures of a physical product for use in an encyclopedia, for documentation [1] or for marketing. The ...
An illusion closely related to the checker shadow illusion, which also relies on using implied visual shadows to seemingly darken a brighter region to the same color as a well-lit dark region, involves two squares placed at an angle, with the darker square being lit and the lighter square at an angle which receives poor light. [2]
Quadratic (n = 2) – This is how light intensity decreases in reality if the light has a free path (i.e. no fog or any other thing in the air that can absorb or scatter the light). For a given point at a distance x from the light source, the light intensity received is proportional to 1/x 2. Any number of other mathematical functions may also ...
Lite-Brite is a toy that was originally marketed in 1967. It consists of a light box with small colored plastic pegs that fit into a panel and illuminate to create a lit picture, by either using one of the included templates or creating a "freeform" image on a blank sheet of black paper.
Interior reflectors can be white, silver or gold to alter the temperature of light. Baffling inserts are also available. A variation of this is a box, with one open end, made of diffusing material, to allow the photographing of a sample object with no shadows. It is also called light tent or photo cube. [8]
Those assigned to bright light therapy were made to sit in front of a fluorescent light box that produced extremely bright white light at an intensity of 10,000 lux for at least 30 minutes daily.
A point source of light casts only a simple shadow, called an "umbra". For a non-point or "extended" source of light, the shadow is divided into the umbra, penumbra, and antumbra. The wider the light source, the more blurred the shadow becomes. If two penumbras overlap, the shadows appear to attract and merge. This is known as the shadow ...
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