Visible light is an electromagnetic wave, consisting of oscillating electric and magnetic fields traveling through space. The frequency of the wave determines its color: 400 THz ( Hz) is red light, 800 THz () is violet light, and between these (in the range 400–800 THz) are all the other colors of the visible spectrum. An electromagnetic wave with a frequency less than will be invisible to the human eye; such waves are called infrared (IR) radiation. At even lower frequency, the wave is called a microwave, and at still lower frequencies it is called a radio wave. Likewise, an electromagnetic wave with a frequency higher than will also be invisible to the human eye; such waves are called ultraviolet (UV) radiation. Even higher-frequency waves are called X-rays, and higher still are gamma rays.
visible light is an electromagnetic wave consisting of oscillating electric and magnetic fields traveling through space the frequency of the wave determines its color 400 thz ( hz) is red light 800 thz () is violet light and between these (in the range 400–800 thz) are all the other colors of the visible spectrum an electromagnetic wave with a frequency less than will be invisible to the human eye; such waves are called infrared (ir) radiation at even lower frequency the wave is called a microwave and at still lower frequencies it is called a radio wave likewise an electromagnetic wave with a frequency higher than will also be invisible to the human eye; such waves are called ultraviolet (uv) radiation even higher-frequency waves are called x-rays and higher still are gamma rays