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Image before (left) and after (right) adjustment with gray card (middle) Gray card from 100 to 0 in 30 steps. A gray card is a middle gray reference, typically used together with a reflective light meter , as a way to produce consistent image exposure and/or color in video production , film , and photography .
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...
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