Question

What happens to a light ray passing through the center of a lens?

Answer 1

What happens when a light ray passes through the focal point, and then reflects off of a convex mirror?

A.  

The reflected ray will run parallel to the center of curvature.

B.  

The reflected ray will run parallel to the principal axis.

C.  

The reflected ray will pass through the center of curvature.

D.  

The reflected ray will pass through a point between the center of curvature and the focal point.

E.  

The reflected ray will pass through a point between the focal point and the vertex.

Is it out of these choices?

Answer 2

Theoretically, the light ray will not change direction. The center of a lens is called the optical center. If the ray of light hits the lens even just a little bit off center, the light ray is refracted. Refraction happens when the incident and exit angles of the ray are different. The optical center is guaranteed to not have any difference in angle, which allows the light ray to pass through directly without changing direction.