Discuss in detail? Look at a friend's eye in a dimly lit room and observe the size of the person's pupil. Now shine a light in the eye? What happens to the pupils? What happens when you move the light
a) Pupils constrict when light is shone.
b) Pupils dilate when light is shone.
c) No change in pupil size when light is shone.
d) Pupil size varies randomly with light stimulation.