05Light ifig0005

Definition:

Light: Electromagnetic Radiation with Wavelengths of 380–780 nm, to Which the Human Eye is Sensitive.

The earth’s atmosphere is thick with electromagnetic radiation, emitted by sources such as stars, mobile phones, people and buildings. Human beings can only directly detect one narrow band of radiation – the band we recognise as running through the colours of the rainbow from red to violet: visible light. On either side of the band of visible light are the infrared and ultraviolet wavelengths: although we cannot see either of those, we can feel the warming effect of infrared and experience the harmful effects of ultraviolet ...

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