Which type of light rays has a positive vergence?

Convergent rays are characterized by a positive vergence because they are light rays that come together at a focal point after originating from a source. In the context of optics, vergence is a measure of how much the rays are converging or diverging. When rays are converging, they have a positive vergence value, indicating that they are moving towards each other.

This concept is essential in understanding how lenses work, as convergent lenses bend incoming parallel rays of light to a point, effectively focusing them. On the contrary, divergent rays, which spread out from a point source, result in negative vergence values. Paralleled rays maintain a constant direction without convergence or divergence, resulting in zero vergence. Reflected rays can change direction but do not inherently possess a vergence value in the context of convergence towards a point. Understanding these differences is crucial for anyone studying optics or preparing for an optician licensing examination.