What happens to a light ray if it is incident on an object's surface along the normal?
The incident ray retraces its original path.
The incident ray is reflected perpendicular to the normal.
The incident ray is reflected at an angle to the normal.
The incident ray is not reflected.

Question

What happens to a light ray if it is incident on an object's surface along the normal?
The incident ray retraces its original path.
The incident ray is reflected perpendicular to the normal.
The incident ray is reflected at an angle to the normal.
The incident ray is not reflected.

anonymous · Answer

The principle is that the angle of reflection equals the angle of incidence.

anonymous · Answer

The angle is measure from the normal to the surface.