Explanation:
When rays from different directions meet or come together at a single point, they are called convergent rays. Let's understand this concept in detail.

Intersecting Rays:
Intersecting rays are rays that cross each other at a point. They do not necessarily meet at a single point but form an intersection. The rays can be from different directions and can intersect at different points. In the case of intersecting rays, there is no convergence or divergence.

Parallel Rays:
Parallel rays are rays that never meet or cross each other. They maintain a constant distance from each other and travel in the same direction. Parallel rays are always equidistant and do not converge or diverge.

Divergent Rays:
Divergent rays are rays that spread out or diverge from a single point. They move away from each other in different directions. Divergent rays do not meet or converge at a single point but spread out in various directions.

Convergent Rays:
Convergent rays are the opposite of divergent rays. They come together or converge at a single point. When rays from different directions meet or intersect at a common point, they are referred to as convergent rays. These rays can be drawn back to form a single point from where they originate.

The correct answer to the given question is option 'D', convergent rays, as the rays from different directions assemble or come together at a single point.

To summarize, when rays from different directions meet at a single point, they are called convergent rays. This is the case of convergence, where the rays come together at a specific point.