Convert the wavelength unit from a U.S. or imperial linear unit to the S.I. unit of meters. Use the following relationships to convert to meters: 1 meter (m) = 39.27 inch = 3.28 feet. For example, a length of 27 inches = 0.69 m = (27 inch/39.27 inch) x (1 m). A length of 18 feet = 5.49 m = (18 feet/3.28 feet) x (1 m).
Convert the unit from meter to nanometer by multiplying by 10^9. For example, a wavelength of 5.49 m = 5490000000 = (5.49 x 10^9). Multiplying by 10^9 is equivalent to moving the decimal point nine positions to the right.
Write the length units after the wavelength. Use the abbreviation nm for nanometers. For example, a wavelength of 5.49 m converted to nanometers is 5.49 x 10^9 nm.