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Chapter 17: Reflection and Refraction

Practice Test
  1.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by light  
  c.   by electrical impulses  
  d.   by different colors  
  2.Your image in a bathroom mirror results from __________.  
  a.   regular refraction  
  b.   diffuse refraction  
  c.   regular reflection  
  d.   diffuse reflection  
  3.A light ray is traveling through an unknown material when it intersects ethanol (n = 1.36) at an incident angle of 62.0°. If the angle of refraction is 46.4°, what is the index of refraction of the unknown material?  
  a.   1.12  
  b.   1.66  
  c.   2.00  
  d.   0.985  
  4.If a refracted ray moves away from the normal, the speed of light of the ray in this material is __________ that of the incident ray.  
  a.   greater than  
  b.   unrelated to  
  c.   the same as  
  d.   less than  
  5.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   behind you  
  b.   directly overhead  
  c.   in front of you  
  d.   in the center of the rainbow  
  6.What is the speed of light in a diamond (n = 2.42)?  
  a.   1.24 × 108 m/s  
  b.   7.26 × 108 m/s  
  c.   2.42 × 108 m/s  
  d.   3.00 × 108 m/s  
  7.How does light normally travel?  
  a.   in a straight line  
  b.   always toward a dark area  
  c.   in concentric circles  
  d.   in a curved line  
  8.A beam of light travels through air (n = 1.0003) and strikes an unknown material at an angle of 50.0°. The new angle of refraction is 25.0°. What is the index of refraction of this material?  
  a.   0.643  
  b.   1.20  
  c.   1.81  
  d.   0.709  
  9.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing less optically dense than a vacuum  
  b.   because optical fibers must use glass  
  c.   there is nothing for light to travel through  
  d.   because a vacuum is too optically dense  
  10.If a substance has a critical angle of 50°, what happens to the light from an incident angle hitting the boundary at 30°?  
  a.   it is stopped  
  b.   it is refracted  
  c.   it is diffused  
  d.   it is reflected  

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