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In 1873, James Clerk Maxwell proposed that light consists of electromagnetic waves. According to his theory, an electromagnetic wave has an electric field and magnetic field components. These two components vibrate in two mutually perpendicular planes (Figure 1.6). EMR is the emission and transmission of energy in the form of electromagnetic waves. Figure 1.6: The electric field and magnetic field components of an electromagnetic waves Electromagnetic waves have three primary characteristics: wavelength, frequency and speed. Wavelength (λ, Greek lambda), is the distance the wave travels during one cycle (Figure 1.7). It is expressed in meters (m) and often, for very short wavelengths, in nanometers (nm), picometers (pm), or angstrom (Å). Frequency (ν, Greek letter nu) is the number of cycles the wave undergoes per second and is expressed in units of l/second (1/s; also called hertz, Hz).

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