Light and Colour



Visible light radiating from the sun consists of a broad spectrum of wavelengths ranging from violet to red. When light strikes a material, some of the wavelengths are reflected and others are absorbed. The characteristics of a material and the incident light striking them determine the apparent colour of an object. Light can be used to measure an object’s temperature; for example, blue stars are hotter than red stars.

Display devices mix red, green, and blue (RGB) light to form different coloured pixels in an image. Likewise, digital cameras separate and measure the RGB light from a scene to form digital ...

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