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Figure 7: Electromagnetic Radiation Reaching the Earth (Liberman & Grbevski, 2001) Of all the frequency ranges in the electromagnetic spectrum, the most familiar is that of visible light. Only waves between about 390 Nm and 740 Nm are perceived by the human eye. The higher colours of the visible spectrum have higher frequencies (green, turquoise, indigo and violet) and shorter wavelengths and the lower colours have lower frequencies and longer wavelengths (yellow, orange and red). White light is a mixture of the whole range of visible light. Thus white light contains all the colours of the spectrum. If white light is passed through a glass prism the different wavelengths spread out and are then seen as the entire colour spectrum (Christian, 2004). Therefore, Visible Light can be defined as electromagnetic radiation that is produced in differing wavelengths between 390 and 740 nanometres that can be seen by the naked eye. When these light waves or beams of particles/photons reflect off objects and enter our eyes, they create the sensation of light and make the outer world visible to be perceivable to our senses. Colour can be defined as any one or mixture of the constituents into which light can be separated as a spectrum or rainbow (Giancoli, 1997). 15PDF Image | THE USE OF LIGHT AND COLOUR AS A HEALING MODALITY
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