The light reactions require solar energy and the dark reactions utilize the products of the light reaction to drive CO 2 fixation. Produce carbohydrates from CO 2 fixation via the Calvin cycle. Light moves like a wave and can be characterized by the distance between the waves called wavelength. The wavelengths between 380 and 750 nm are known as the visible wavelengths because our eyes can see these in the form of various colors. So light behaves like waves.
Light also behaves like particles referred to as photons.
They are discrete particles with discrete energy associated with them.