Introduction
Light or visible light is the part of electromagnetic radiation that is visible to the human eye and is the reason for the sense of sight. The wavelength of visible light is in a range from 400 nm to 780 nm. This comes to be about 405 THz to 790 THz in frequency. In the perspective of physics, the term light generally consists of the adjacent radiation regions of infrared (at lower frequencies) and ultraviolet (at higher) that are not visible to the human eye. The major and fundamental properties of light are frequency, intensity, propagation direction, wavelength and polarization. The light exhibits the properties of both waves and particles when it is emitted and absorbed in tiny packets called photons. This property is called wave – particle duality. The above mentioned property of light has been the important research area in modern physics. The speed of light in a vacuum is determined to be precisely 299,792,458 m/s (approximately 186,282 miles per second). The Electromagnetic Radiation has been divided by the wavelength in the following waves:
· Radio waves
· Microwaves
· Infrared
· Ultraviolet
· X-rays
· Gamma rays
The properties of EM radiation vary according to its wavelength. Higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths.
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