Question

A ray that intersects a plane in one point (sketch)

Answer 1

Draw any plane you want. Pick a ray of any length, in the direction of a normal vector to the plane, which intersects the plane. So for example draw the plane z=5. A normal vector to this plane is in the direction of the z-axis. So draw a ray through the plane and make sure it is parallel to the z-axis.

Answer 2

oh yeah, rays go one forever in one direction so you can't really pick one of any length lol