ABO NOCE Practice Test

What type of motion does a plus lens exhibit when placed in a specific context?

1. Moves with motion

2. Moves against motion

3. Does not move

4. Moves in random motion

The correct answer is: Moves against motion

A plus lens, when placed in a specific optical context, typically exhibits "moves against motion." This term refers to the behavior observed when light passes through a converging lens, which focuses incoming parallel rays of light into a point. When an object moves towards a plus lens, the image produced moves in the opposite direction (i.e., it appears to move away from the lens). This phenomenon is due to the way a plus lens refracts light; as it converges light rays, the resulting image location shifts relative to the object’s movement. Understanding this principle is crucial in optics, particularly in applications like eyeglasses and camera lenses, where the manipulation of light pathways is essential for achieving clear focus. The other possibilities—such as "moves with motion," "does not move," and "moves in random motion"—do not accurately describe the predictable and opposite imaging behavior of a plus lens as it refracts light. This consistent behavior directly relates to how lenses function, emphasizing the importance of understanding optical properties for practical application.