Fifteen minutes after Zigfried left the brightly lit hallway and entered the dark passageway, what would you expect about his dark adaptation?

Question

Quizplus · Accepted Answer

The process of dark adaptation involves the gradual increase of sensitivity of the eyes in low light conditions, particularly in the rods. Cones, on the other hand, are less sensitive to dim light and do not contribute much to dark adaptation. Since Zigfried entered a dark passageway, it is likely that his dark adaptation is still taking place in the rods, but complete in the cones. Therefore, the best answer is D, which indicates his cones are already adapted, but his rods may still be adapting.

Fifteen Minutes After Zigfried Left the Brightly Lit Hallway and Entered