Which characteristic is NOT associated with the concept of centrad?

The concept of centrad refers to a unit of measurement used in optics, specifically in the context of refraction and lens design. It is closely related to how light rays are deviated as they pass through optical mediums. The terms associated with centrad involve parameters that directly relate to the path and behavior of light as it is refracted.

In this context, image magnification is not a characteristic typically associated with centrad. Instead, centrad focuses on measurements and angles relevant to the bending of light (like the angle of deviation), the displacement of light rays, and the actual measurement of refraction—essentially how much light shifts when passing through a lens or optical system.

Image magnification, while crucial in optics, relates more to the size of the image produced by an optical system rather than the angular or linear displacement properties that centrad addresses. Thus, it stands apart from the core concepts tied to centrad, making it the correct choice for this question.