Brent is conducting an experiment where he has participants look at a red square with one eye for 30 to 45 seconds. he then has them look at various colored objects in the environment. they report differences in the saturation of red and orange objects based on which eye they use. what phenomenon is brent studying?

chromatic adaptation                                    

Explanation:

Chromatic adaptation: The term chromatic adaption refers to the ability of human beings visual system to cope up or adjust with changes in the illumination to preserve the object's colors appearances. Due to chromatic adaptation, an object appears to be stable in color irrespective of the wide-variation of different light that might reflect from an object and being observed through an individual's eyes.

In the question above, Brent is studying the chromatic adaptation phenomenon.

for your question the answer would have to be france