Visible light ranges from about 390 to 790 nm, frequence (from 3.9×1014 Hz to 7.9×1014) Hz. Under some conditions there also possible take place total reflection.
Inayoonekana mwanga ni kati ya juu 390-790 nm, frequence (kutoka 3.9 × 10 14 Hz kwa 7.9 × 10 14) Hz. Chini ya baadhi ya masharti kuna uwezekano pia kuchukua nafasi reflection jumla.