optiline kiirgus, mis on otseselt võimeline tekitama nägemisaistingut
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Nähtava kiirguse kohta ei ole täpseid rajaväärtusi, kuna selle toime sõltub võrkkestani ulatuvast kiirgusvoost ja vaatleja reageerimisvõimest. Alamrajaks loetakse üldiselt 360 nm kuni 400 nm ja ülemrajaks 760 nm kuni 830 nm.
any optical radiation capable of directly causing a visual sensatio
Good to know
There are no precise limits for the spectral range of visible radiation since they depend upon the amount of radiant power reaching the retina and the responsivity of the observer. The lower limit is generally taken between 360 nm and 400 nm and the upper limit between 760 nm and 830 nm.
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