Today I would like you to investigate how a rainbow is formed and how the human eye sees things, including how nearsightedness and farsightedness are corrected. These concepts correspond to questions 12 and 14 on your 14+15 Review Sheet. Both of these concepts will be short answer questions on your test on Thursday.
Instructions for Rainbows:
1. Go to The Physics Classroom Link (bottom one)
2. Go to Physics Tutorial
3. Go to Refraction and Ray Model of Light (last one I think)
4. Go to Lesson 4 and pick Rainbow Formation
Focus on the diagrams for how a rainbow is formed. What 2 things happen to the light waves? (think about the wave properties we have discussed). Draw a picture of what happens in the water droplet. If blue comes out on top of the droplet, why is it that red is on top of the rainbow that we see? What 3 requirements are needed to see a rainbow? (this is in the very last sentence of the rainbow section)
Instructions for The Eye:
5. Follow previous instructions in Physics Classroom, but go to Lesson 6 (The Eye)
6. Read about Anatomy (a), and Image formation (b)
7. Read about farsightedness and correction (d)
8. And nearsightedness (e)
Check out the eye diagram and how the human eye works. How does the lens help focus to near and far? What is wrong with a person's eye if they are farsighted and how is it corrected? What is wrong with a person's eye if they are nearsighted and how is it corrected?
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