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Physics 142 Refraction and Lenses Bonus Activity
Name Recitation section ______
For full credit, due by 2:30 pm, Friday, 9/29/ 12 points (Two points each.)
- A ray of light is incident upon an air-water surface.
Measure all three angles, i.e. incidence, reflection and refraction. From which direction is the light coming (left, right, or below?) Explain your answer. What is the index of refraction of the water? How does your result to compare to typical values for water?
- A ray of light is incident upon an air-glass interface at an angle of incidence very close to the critical angle. From which direction is the light coming? Explain your answer.
Measure the critical angle. Use it to compute the index of refraction of the glass.
- Five parallel rays of light(from the left) pass through this lens. Assume the picture is actual size.
What kind of lens is it? Determine the location of the focal point of the lens. How do you explain the apparent focal point caused by the weakly reflected light rays? Compare the two different focal lengths. How do you explain their difference?
- Five rays of light are incident upon a combined system of two lenses. Assume the picture is actual size.
Determine the focal length for each of the two lenses and then the focal length of the combination of the lenses. Determine a rule for computing the focal length of a combined lens system. How do you explain the focal point of the weakly showing rays? How do you explain the colors in the "white" light near the right edge of the photograph?
