Thus, a straight-on impact (along the normal) is said to have an angle of incidence of zero.Īperture - Adjustable opening, also referred to as f-stop, that controls the amount of light that is focused on the film.Īperture preference - Term used to describe the automatic exposure system used on some cameras, in which a specific aperture is selected but the shutter speed adjusts automatically to expose the film to the correct amount of light.Īrtificial light - Any light other than daylight.Īrtificial light film - Color film balanced for use in tungsten artificial light, usually of 3200°K. The normal is an imaginary line perpendicular (90°) to the plane of the surface. Actinic rays - light rays of short wavelengths occurring in the violet and ultraviolet parts of the spectrum, which produce chemical changes, as in photography.Īngle of incidence - the angle of incidence as used here conforms to that used in optics to describe reflection and refraction of light rays.The angle is measured with respect to the normal to the surface, rather than to the surface itself.
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