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.
Which colors of light are most effective and where in the brain these non-visual effects can be seen was previously not known. Now researchers have 'shed some novel light' on these issues by using functional magnetic resonance (fMRI) brain imaging while the participant were engaged on a working memory task.