2009

Intensity
The intensity of light at its point of origin affects how brightly the light
illuminates an object. A dim light cast on a brightly colored object shows only
dim colors.
Left: A room lit by candles, which are a low-intensity source.
Right: The same room lit by a higher-intensity light bulb.
Angle of Incidence
The more a surface inclines away from a light source, the less light it receives
and the darker it appears. The angle of the surface normal relative to the light
source is known as the angle of incidence.
When the angle of incidence is 0 degrees (that is, the light source strikes the
surface perpendicularly), the surface is illuminated with the full intensity of
the light source. As the angle of incidence increases, the intensity of
illumination decreases.
Using Lights | 4979