Our eyes can see only a part of the sunlight. which is called visible light. In this light there is a sequence of colors violet, sky, blue, green, yellow, orange, and red.
Among these, violet light has the shortest wavelength and red light has the longest wavelength. Which are respectively expressed by the words VIBGYOR.
Their wavelength ranges from 0.4 microns to 0.70 microns. (1 Microns = 10-6 Meter)