Skills W o rksheet Reinforcement
Name
Class
Date
Skills Worksheet
Reinforcement
Fiona, Private Eye
Complete this worksheet after you finish the section "Interactions of Light with Matter."
Fiona wants to be a detective. In order to pass the entrance exam to Private Eye University, she is practicing her spy skills on her friends Jorge, Charles, and Tamika. Reflection is one of the hardest sections on the exam. Use what you have discussed in class to help Fiona learn about the law of reflection.
1. Figure 1 in Fiona's notes shows a beam of light hitting and reflecting off a mirror. Label the normal, incident beam, reflected beam, angle of incidence, and angle of reflection on the diagram. Fiona knows from the law of reflection that the angle of incidence always equals the angle of reflection. She uses this law to plan a system of mirrors that will allow her to spy on her friends. With her special arrangement of mirrors, Fiona can watch her friends walk by as she hides behind a brick wall.
Figure 1
a.
Light
d.
c.
source
b. e.
Mirror
2. Figure 2 shows the arrangement of mirrors. Using the law of reflection, draw the path of light as it would reflect off each of the mirrors. The normals have been drawn on the reflecting surfaces for you. (Hint: Not all the mirrors will be used.)
Figure 2
_ _ _ _
____
____
_ _ _ _
____
Fiona
Jorge Charles Tamika wall
3. Which of her friends is Fiona able to see with her mirrors in their
current arrangement?
Copyright ? by Holt, Rinehart and Winston. All rights reserved.
Holt California Life Science
35
Light and Living Things
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