Reflectors are generally used for redirecting light from a non directional light source, such as a light bulb, to a particular direction. The most common
types of Reflectors include Spherical Reflectors, Parabolic Reflectors and
Elliptical Reflectors.
For Spherical Reflectors, if the light source is placed at the center of the
sphere, the light rays will be directed back to the source:
If the light source is placed on the focal surface instead, the reflected
light rays will be collimated. The focal surface is defined as a spherical
surface with half the radius as the reflector:
The reflected light rays are also collimated when the light source is at the
center of a Parabolic Reflector:
If the light source is placed at the first of the two foci of an Elliptical Reflector,
all the reflected light rays will be focused towards the second focus of the ellipsoid:
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