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Monochromatic radiation
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<p>In <a href="/facts/Physics/a7aH2y08">physics</a>, monochromatic radiation is <a href="/facts/Electromagnetic_radiation/Ynx7ujCW">electromagnetic radiation</a> with a single constant <a href="/facts/Frequency/QUSbPaW8">frequency</a> or <a href="/facts/Wavelength/kcJU0ymz">wavelength</a>. When that frequency is part of the <a href="/facts/Visible_spectrum/frPBh8o5">visible spectrum</a> (or near it) the term monochromatic light is often used. Monochromatic light is perceived by the <a href="/facts/Human_eye/a24ua4fy">human eye</a> as a <a href="/facts/Spectral_color/SG0F8xet">spectral color</a>. </p><p>When monochromatic radiation propagates through <a href="/facts/Vacuum/BTk3goyV">vacuum</a> or a homogeneous transparent medium, it remains with a single constant frequency or wavelength; otherwise, it suffers <a href="/facts/Refraction/S8kvSKzM">refraction</a>. </p>