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Chapter 17: Reflection and Refraction

Practice Test
      
  1.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.   less than  
  b.   greater than  
  c.   the same as  
  d.   unrelated to  
  Hint    
      
  2.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   slow down  
  c.   travel at the same speed  
  d.   speed up  
  Hint    
      
  3.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing for light to travel through  
  b.   because a vacuum is too optically dense  
  c.   there is nothing less optically dense than a vacuum  
  d.   because optical fibers must use glass  
  Hint    
      
  4.What is the speed of light in a diamond (n = 2.42)?  
  a.   3.00 × 108 m/s  
  b.   2.42 × 108 m/s  
  c.   1.24 × 108 m/s  
  d.   7.26 × 108 m/s  
  Hint    
      
  5.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by light  
  c.   by electrical impulses  
  d.   by different colors  
  Hint    
      
  6.A light ray traveling through crown glass (n = 1.52) intersects a sheet of flint glass (n = 1.61) at an angle of 27.3°. What is the angle of refraction?  
  a.   25.7°  
  b.   0.433°  
  c.   33.0°  
  d.   0.839°  
  Hint    
      
  7.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   prevents scattering of light  
  c.   reduces refraction  
  d.   prevents reflection  
  Hint    
      
  8.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.   2.00  
  b.   0.985  
  c.   1.12  
  d.   1.66  
  Hint    
      
  9.What does Snell's law compare?  
  a.   the density of the materials  
  b.   the cosines of the refracted angles  
  c.   the reflective nature of materials  
  d.   the sines of the refracted angles  
  Hint    
      
  10.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.   0.709  
  c.   1.81  
  d.   1.20  
  Hint    

 
   
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