Hello, pantera!

The angle between two vectors is given by: .A ray of light coming from the point (-1, 3, 2) is travelling in direction

and meets the plane

Find the angle that the ray of light makes with the plane.

The ray has direction: .

The plane has normal direction

The angle between the ray and the normal is:

. .

Hemce,

Therefore, the angle between the ray and the plane is about: .