Which scientist showed that plants use red and blue light in photosynthesis?

Englemann is the scientist who showed that plants use red and blue light in photosynthesis.

-Engelmann devised an experiment to learn which wavelengths (colors) of light were the most effective in carrying out photosynthesis in the green alga Spirogyra.

-He found that certain red and blue wavelengths of light are the most effective in photosynthesis because they have exactly the right amount of energy to energize, or excite, chlorophyll electrons and boost them out of their orbits to a higher energy level.

i think the miocene epoch spans the time from 23 million to 12 million years ago.

true is the answer : )