Back النافذة البصرية Arabic Οπτικό παράθυρο Greek Jendela optik ID 可視光の窓 Japanese Optisk vindauge NN Optisk vindu NB Okno optyczne Polish Оптички прозор Serbian Optiskt fönster Swedish Optik oyna Uzbek
The optical window is the portion of the optical spectrum that is not blocked by the Earth's atmosphere. The window runs from around 300 nanometers (ultraviolet-B) up into the range the human eye can detect, roughly 400–700 nm and continues up to approximately 2 μm.[1][2] Sunlight mostly reaches the ground through the optical atmospheric window;[3][4] the Sun is particularly active in most of this range (44% of the radiation emitted by the Sun falls within the visible spectrum and 49% falls within the infrared spectrum).[5]
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