Optical radiation is the part of the electromagnetic spectrum with wavelengths between 100 nm and 1 mm.[1][2] This range includes visible light, infrared light, and part of the ultraviolet spectrum.[3] Optical radiation is non-ionizing,[4] and can be focused with lenses and manipulated by other optical elements. Optics is the study of how to manipulate optical radiation.
BfS was invoked but never defined (see the help page).HSE was invoked but never defined (see the help page).