VAPORIZATION Conversion of a solid or liquid into a vapor.
VIGNETTING The loss of light through an optical element when the entire bundle
of light rays does not pass through; an image or picture that shades off gradually
into the background.
VISIBLE RADIATION (LIGHT) Electromagnetic radiation which can be detected by
the human eye. It is commonly used to describe wavelengths which lie in the range
between 400 nm and 700-780 nm.