Repetition Definition. Repetition is a literary device that repeats the same words or phrases a few times to make an idea clearer. There are several types of repetitions commonly used in both prose and poetry.
Chlorophyll looks green to us because most of the green wavelengths are reflected rather than being absorbed. For this reason, green light is not an effective color of light to power photosynthesis. Chlorophyll a and b together absorb light most effectively in the blue to violet range and the orange to red range.
The Young-Helmholtz theory of color vision is the most widely acknowledged trichromatic theory. Later analyses ascertained that there are three varying retinal cone photopigments with peak sensitivities nearly correlating to the three primary hues of trichromatic theory: green, red, and blue.