Visible light waves are the only electromagnetic waves we can see. They are around 400 nm to 700 nm. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. No medium is needed. Visible light is just normal light. Light that we use everyday. Light that allow us to see objects, as they rebound and reflect into our eyes. However, the disadvantage is that if there is too much light, our eyes will not be able to take it and might suffer injuries.
Source:
http://science.hq.nasa.gov/kids/imagers/ems/visible.html
http://www.darvill.clara.net/emag/emagvis.htm
http://www.universetoday.com/34579/visible-light/
http://www.windows2universe.org/physical_science/magnetism/em_visible_light.html
http://library.thinkquest.org/C006027/html-ver/es-visible.html
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