What is the term for the apparent displacement of an object based on the angle at which it is viewed?

The term describing the apparent displacement of an object based on the angle at which it is viewed is indeed parallax. Parallax occurs when an object is observed from different positions, causing it to appear in different locations relative to a background. This phenomenon is commonly experienced when viewing objects with one eye and then the other, or when an observer moves side to side, resulting in a shift in the object's apparent position.

In optics, parallax is significant for tasks such as sighting in rifles or calibrating instruments, as it helps determine the correct aim point by factoring in the observer's viewpoint. This understanding is critical for ensuring accuracy in measurements and aiming.

Refraction describes the bending of light as it passes through materials of different densities and does not specifically pertain to the displacement related to the observer's angle. Distortion generally refers to a change in the quality or shape of an image rather than to the displacement of an object. Interpolation is a mathematical concept related to estimating values between known data points and does not relate to the concept of visual displacement.