Final answer:
Convergence is a binocular depth cue that requires two eyes to perceive depth and is not a monocular depth cue, which can be perceived using just one eye. Therefore, the correct answer to the student's question is (E) Convergence.
Step-by-step explanation:
The student's question pertains to the topic of visual perception, more specifically, the concept of monocular depth cues versus binocular depth cues and which of the given options is not a monocular depth cue. Monocular depth cues, such as linear perspective, interposition, relative size, and texture gradient, are valuable in how we perceive depth in our environment using just one eye. These cues are based on our past experiences and the visual information available from the two-dimensional visual field.
On the other hand, convergence is a binocular depth cue, which involves the inward movement of our eyes when we focus on nearby objects and requires the use of both eyes to perceive depth. This is different from the monocular cues which only need one eye. Therefore, option (E) Convergence is not a monocular depth cue, but rather a binocular depth cue.