Ultraviolet spectrum ultraviolet spectrum can be divided into: A, wavelength 290--320nm; Medium wave ultraviolet (UV-B). B, wavelength 320--400nm; Long wave ultraviolet (UV-A). C, wavelength 400--760nm; Visible light. What is 'nanomei '?
'Nanometer' is an English namometer (Abbreviation: nm)
Of translation is a measure of the unit a nano-for-inch maximum 1mm is also a billionth of a metre about equivalent to 45 a atomic string in with the length.