Diverging lens
A lens which causes rays of light coming from the subject to bend away from the optical axis.
DMA (Direct Memory Access)
Allows the I/O subsystem to access main memory for the transfer of data.
Also known as a reverse or inverted telephoto, this lens design has a diverging lens element positioned in front of the aperture and a converging element positioned at the rear.
For a converging lens (for example a convex lens), the focal length is positive, and is the distance at which a beam of collimated light will be focused to a single spot. For a diverging lens (for example a concave lens), ...
the light is refracted. The incorporation of various lenses (converging and diverging lenses) creates a lens system. When optimally arranged, they allow the subject to be presented correctly on the image plane.
 See also: Diverging, Lenses, Lens, Camera, Focal length
  
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