In what fundamental way do we (and many other animals)utilize parallax for the measurement of distance?
A) Our eyes focus back and forth continuously, and the brain interprets the focusing in terms of distance to the object viewed.
B) The eye can measure the time taken for light to travel from an object, and the brain interprets this information in terms of distance to the object viewed.
C) We are always moving our heads slightly from side to side, and the brain compares look angles from each of these positions to obtain the distance to the object viewed.
D) Our eyes are mounted horizontally about 10 cm apart in our heads, and the brain interprets the relative look angles of these eyes in terms of distance to the object viewed.

Question

Quizplus · Accepted Answer

Our eyes are mounted horizontally about 10 cm apart in our heads, which creates a small discrepancy in the images received by each eye. The brain calculates the difference in look angles and uses this information to determine the distance to the object viewed. This is known as binocular parallax and is a fundamental way that humans and many other animals (with horizontally placed eyes) measure distance.

In What Fundamental Way Do We (And Many Other Animals)utilize