Fifteen minutes after Zaigham left the brightly lit hallway and entered the dark passageway, dark adaptation was:
Correct answer: C. Complete in his cones, but still taking place in his rods
- A. Complete in both his rods and cones
- B. Not taking place in his cones, but complete in his rods
- C. Complete in his cones, but still taking place in his rods
- D. Still taking place in both his rods and his cones
Explanation
Cones adapt quickly and are usually fully adapted after about 10 minutes in darkness, whereas rods continue adapting for much longer, often around 30 minutes. After 15 minutes, cone adaptation is complete but rod adaptation is still occurring.
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