Final answer:
Brenda, with only one eye, is unable to use retinal disparity as a depth cue because it relies on binocular vision. Monocular cues like interposition, texture gradient, and relative size are still accessible to her for depth perception.
Step-by-step explanation:
The question pertains to the depth cues our brains use to perceive a three-dimensional world from two-dimensional information. There are two types of depth cues: monocular cues, which require only one eye, and binocular cues, which rely on the use of both eyes. For example, retinal disparity is a binocular depth cue that arises from the slight differences in the images projected on each of our retinas due to the space between our eyes (interocular distance).
Answering the student's question, Brenda, having only one eye, would be unable to use the depth cue known as retinal disparity because this particular cue requires the comparison of visual information from both eyes, which is not possible with the use of just one eye. Monocular cues like interposition, texture gradient, and relative size can still be used by a person with one eye, as these cues do not depend on having two functional eyes to perceive depth.