Light bends as it passes through substances of different densities, a process known as

_____ is the way the brain deals with unchanging information from the environment.

If a researcher finds that one drop of perfume diffused through a three-room apartment is the minimum amount of stimuli needed to notice the scent, then this would be a test of one's

"Packets" of light waves are referred to as

Color is largely determined by the

As your lens hardens through aging, you may have trouble with

The image projected on the retina is

Full dark adaptation, such as going from constant light to sudden darkness when turning out one's bedroom lights, takes about _____ minutes.

Thomas Young's theory of color vision