1. Our ability to see three dimensions based on having only a two-dimensional retina is known as
A. depth perception
B. sensory accommodation
C. visual acuity
D. rod-cone refractance
2. If the human eye was not responsive to differences in the amplitude of light waves, we would not be able to perceive differences in
A. saturation
B. purity
C. color
D. brightness
3. If the human eye was not responsive to differences in the purity of light waves we would not be able to perceive differences in
A. hue
B. brightness
C. color constancies
D. saturation