Region of the electromagnetic spectrum extending from about This
is the wavelength region to which the human eye is sensitive.
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 on the responsivity of the observer.
PAC, 2007, 79, 293 (Glossary of terms used in photochemistry,
3rd edition (IUPAC Recommendations 2006)) on page 439 IUPAC.
Compendium of Chemical Terminology, 2nd ed. (the "Gold Book").
Compiled by A. D. McNaught and A. Wilkinson. Blackwell
Scientific Publications, Oxford (1997). XML on-line corrected
version: http://goldbook.iupac.org (2006-) created by M. Nic, J.
Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN
0-9678550-9-8. doi:10.1351/goldbook