The light from fluorescent types of lights do not contain all the frequencies of sunlight and so clothes inside a store may appear to be a slightly different color when you get them home. Typically, the human eye can detect wavelengths from 380 to 700 nanometers. For the spectrum say I have the emission spectrum of a white light, then every wavelength in the spectrum will have an intensity of 1, whereas for a green-bluish light Id have most of the wavelengths between 500 and 550 with an intensity close to 1, with other wavelengths gradually dropping in intensity. More simply, this range of wavelengths is called visible light. If your only light source was one exact frequency of blue light and you shined it on a shirt that was red in sunlight, the shirt would appear black because no light would be reflected. The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. Therefore, if your friend is wearing a red shirt, it means the dye in that shirt absorbs every frequency except red and the red frequencies are reflected. Your eyes detect the frequencies that strike your eye. The objects that you see around you are light absorbers-that is, the chemicals on the surface of the object will absorb certain frequencies and not others. If there are no visible frequencies striking the eye, the brain sees black. If all frequencies of light strike the eye together, the brain sees white. For example, grass appears green in white light: red, orange, yellow, blue, indigo and violet are absorbed by the. When the eye receives several different frequencies at the same time, the colors are blended by the brain. White light is a combination of all of the colours in the visible light spectrum. When the energy of the wave is above or below the visible range, the eye does not respond to them. The highest energy waves in the visible region cause the brain to see violet and as the energy decreases, the colors change to blue, green, yellow, orange, and red. The eye sends a signal to the brain and the individual "sees" various colors. The light energies that are in the visible range are electromagnetic waves that cause the human eye to respond when those frequencies enter the eye. The borders of each region are approximate. \): The electromagnetic spectrum, with its various regions labeled.
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