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For the term "".

The role of contrast in ability of human vision

The contrast issue has been mentioned in this article, and either during the description of the role of horizontal visibility in long-distance observations. Because the information is not sufficient enough for my further studies...

Light around us and how to measure it

Light surrounds us everywhere. This is an electromagnetic wave, which is the fastest in the environment. For Earth, the main source of light is the Sun. Another source is artificial lightning, created by humankind....