1. Does squinting help you see things more clearly? Explain.

2. Why, when there are very low-light conditions, are you unable to see color?

3. Stand in a well-lit room facing a mirror. Close your eyes for 30-60 seconds. Open your eyes and focus on your pupils. What happens immediately after you open your eyes?

4. On a ray diagram, how can you tell if an image is in focus? When looking at the image itself, how can you determine if it is in focus?

5. What is the blind spot in your eye caused by?