Computer Science 215
                               Quiz F      Name ______________________

1. Recursion is required in the raytracer to properly handle

   a. ambient light                  b. diffuse light

   c. specular light                 d. all of the above

2. When a light ray bounces off of the object which of the
   following should be <<OMITTED>> from testing to see what the
   ray hits next

   a. any light                      b. any plane

   c. the object the ray just        d. all of the above
      bounced off of

3. Suppose U is a unit vector in the reverse of the incoming direction of
   a light ray and N is a unit normal to the surface at the
   point at which the ray hits.  An outgoing unit vector in
   the direction of the reflection is given by:

   a. 2 (U dot N) U - N              b. 2 (U dot N) N - U

   c. 2 (N dot N) U - U              d. 2 (U dot U) N - U