^What is visible light
EM-radiation that can be detected by the human eye is called white light or simply visible light. It is mainly through visible light and the sense of vision that we know and interpret the world around us. Sensation of colour of light perceived by the human eye is determined by its frequency of the wave falling on ratina cells and not on its wavelength.
Visible light is a mixture of photons of wavelengths from 380 nm to 780 nm in appropriate proportion. Following table displays the wavelength range for colours.
In terms of micrometer (μm) & angstroms (A0) we can write 570 nm = 0.57 μm = 5700 A0