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Ray tracing From Wikipedia, the free encyclopedia Ray tracing is a general technique from geometrical optics of modeling the path taken by light by following rays of light as they interact with optical surfaces. It is used sysytems, such as carera lenses, microscopes, telescopes and binculars. The term is also applied to mean a specific rendering algorithmic approach in 3D computer graphics, where mathematically-modeled vuisualisation of programmed scenes are produced using a technique which follows rays from the eyepoint outward, rather than originating at the light sources. http://en.wikipedia.org/wiki/Ray_tracing Ray (optics) In optics, a ray is an idealized narrow beam of light. Rays are used to model the propagation of light through an optical system, by dividing the real light field up into discrete rays that can be computationally propagated through the system by the techniques of ray tracing. This allows even very complex optical systems to be analyzed mathematically or simulated by computer. There are many special rays that are used in optical modelling to analyze an optical system. Aperture Definitions of Aperture in the 1707 Glossographia Anglicana Nova For other uses, see Aperture (disambiguation). Aperture In optics, an aperture is a hole or an opening through which light is admitted. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. go to http://en.wikipedia.org/wiki/Aperture for more... Pinhole camera Principle of a pinhole camera. Light rays from an object pass through a small hole to form an image. A pinhole camera is a camera without a lens. The light producing the image passes through a small hole. In order to produce a reasonably clear image, the aperture has to be a small pinhole on the order of 0.5 mm (0.02 inches) or less. The shutter of a pinhole camera usually consists of a hand operated flap of some light-proof material to cover and uncover the pinhole. Pinhole cameras require much longer exposure times than conventional cameras because of the small aperture; typical exposure times can range from 5 seconds to hours or days. The image may be projected on a translucent screen for real-time viewing (popular for viewing solar eclipses; see also camera obscura), or can expose film or a charge coupled device (CCD). Pinhole cameras with CCDs are sometimes used for surveillance work because of their small size.  How to make and use a pinhole camera
Oatmeal Box Pinhole Photography
Build Your Own Zoetrope movie viewer
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