The difference in wavelength of light causes a light wave to produce blue color and another light wave to produce red color.
Step-by-step explanation:
Light is considered to be a part of electromagnetic spectrum. Light experiences variation in wavelength which causes it to have different colors.
A light with blue color has the shortest wavelength while a light with red color has longest wavelength.
Human eyes can not see all wavelengths of light. Visible light wavelength is the only kind which we can detect.
Changing a wavelength will result in change in color of that light ray.
Color of an object depends on the the light that it reflects.