All green plants are autotrophs. They're an amazingly diverse group. The cells of the green tissues of plants have chloroplasts. An Overview of what happens. Light arriving from the sun is a mix of wavelengths, corresponds to energy levels and colors.
Shorter wavelengths have more energy.
Chlorophyll-a the main pigment in plants mainly absorbs violet and red light. The outer pigments act like a photon antenna shuttling photons in to the chlorophyll-a molecules in the reaction center . There are two photosystems. I absorbs red-light at about 700 nm, so it's called the P700 photosystem, and Photosystem II absorbs more orange light at 680 nm, the P680 photosystem. In the reaction center, it energizes an electron.