Which of the following is not a principal ray of a spherical lens? A. A ray that goes through the center of the sphere. B. A ray that approaches the lens on a line parallel to the axis. C. A ray that approaches the lens on a path to a focal point. D. A ray that hits the lens at the same place the axis does.

Which of the following is not a principal ray of a spherical lens? A. A ray that goes through the center of the sphere. B. A ray that approaches the lens on a line parallel to the axis. C. A ray that approaches the lens on a path to a focal point. D. A ray that hits the lens at the same place the axis does.