Waves with a length of between 0.4 and 0.7 micrometers can be detected by the human eye. For these reason we call these waves visible light. As you look around the room everything you see has these waves bouncing off of them.
Looking directly at the sun for even brief periods of time may cause blindness or severe damage to the eye. Solar retinopathy, damage to the eye’s retina due to solar radiation, and blindness to varying degrees and persistence frequently result from sungazing during a solar eclipse. Although vision loss due to this damage is generally reversible, permanent damage and loss of vision have been reported.
The order of the visible spectrum is Red, Orange, Yellow, Green Blue, Indigo, Violet.
The uses are photoelectric copying machines, laser printers, CD players, camera, microscope, telescope, FAX machines, optical recording media, and optical disc mass-storage systems of exceedingly high bit density.
The dangers of visible light is that there is too much exposure to visible light can cause damage to your retina.
Usages of Visible Light in everyday lives.
-- Watch TV
-- Drive without collisions
-- Read newspaper
-- Watch movies
-- Play video games
-- Distinguish red light from green light when driving in the city
-- Navigate correct routes
-- Enjoy view of moon, stars, and planets
-- Learn when it's raining without going outside
-- Read the GPS screen when driving, between unintelligible verbal instructions
-- Read the gate-numbers at the airport, in order to board the correct airplane
-- See where you're going so you don't bump into things and hurt yourself