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Light is reflection. The only thing we can see is the light source and the surface that reflects the light. Daylight is constantly changing in strength, while the colour (spectrum) of light constantly changes in composition. A cold winterday is blue in colour, a warm summerday is more red in colour.

The visible region of the spectrum is between 320 nanometers and 780 nanometers and contains 15 main colours including purple / blue / green / yellow / orange / red. All wavelengths together are observed as white, a white surface looks  white because it reflects all wavelengths. A red surface appears red because it absorbs most of the lightwaves except the red lightwaves.

 

You will find a number of terms which are perhaps unknown when you inform yourself about natural daylight. A number of these terms are briefly explained below.

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