visible light ranges from about 390 to 790 nm, frequence (from 3.91014 hz to 7.91014) hz. under some conditions there also possible take place total reflection.
Capitalize this past sentence correctly.
Visible light ranges from about 390 to 790 nm, frequence (from 3.91014 Hz to 7.91014) Hz. Under some conditions there also possible take place total reflection.