The point where light rays parallel to the optical axis meet is called the focal point.

Here's why:

* Optical Axis: The optical axis is an imaginary line that passes through the center of a lens or mirror.

* Parallel Rays: Light rays that are parallel to the optical axis are called parallel rays.

* Focal Point: When these parallel rays pass through a lens or reflect off a mirror, they converge at a specific point called the focal point.

This concept is fundamental to understanding how lenses and mirrors work to focus light.