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A visible light spectrum can be defined as the section of the electromagnetic radiation spectrum which is visible to the human eye. Only certain frequency of the electromagnetic spectrum is visible to the human eye and hence it is known as the visible light or light.

The wavelength which is visible to the human eye is from 400nm to 700nm, this wavelength is among the light that is spread in the electromagnetic spectrum. This range is also known as the optical spectrum of light, different colors in the light has different wavelengths. The wavelength is usually described in terms of nanometer. In the electromagnetic spectrum there are certain wavelengths which cannot be perceived by the human eye and hence those colors cannot be seen. So these colors or wavelengths are out of the visible spectrum.

A very common experiment to see the visible spectrum in a lab is carried out using a prism, white light source and a spectrometer. This experiment is very common in schools and universities, it is necessary to have a white light source because, the white light contains all the wavelengths in it. When this white light is made to go through a standard prism then the light is diffracted and the visible spectrum can be seem through a spectrometer. The numbers of colors that are visible to the human eye in the electromagnetic spectrum are seven. They are violet, indigo, blue, green, yellow, orange and red. These are the colors which possess the wavelength that are in the visible range.

Colors that are produced by a single wavelength are known as pure spectral colors; even though they are called pure spectral colors they do not have clear boundaries to show variation between one color and another. This diffraction of light is the cause of rainbow, using special filters and refractors a monochromatic light source can be developed. Till now the laser light is said to be the perfect monochromatic light which has a single wavelength. There are lights of different colors manufactures today which emits different range of wavelengths. The color of the light is proportional to the wavelength of the light source. It is said that the human eye is very limited in the vision, only a small amount of wavelength can be perceived by the human eye, however there are certain animals that can perceive colors that are beyond the human visible spectrum.