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Chapter 17: Reflection and Refraction

Practice Test
      
  1.Through which medium is the speed of light the fastest?  
  a.   glass  
  b.   air  
  c.   vacuum  
  d.   water  
  Hint    
      
  2.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   faster than the speed of light in air  
  b.   slower than the speed of light in air  
  c.   the same as the speed of light in a vacuum  
  d.   the same as the speed of light in air  
  Hint    
      
  3.The line perpendicular to the reflective surface is the __________.  
  a.   normal  
  b.   line of reflection  
  c.   line of incidence  
  d.   line of refraction  
  Hint    
      
  4.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.   0.433°  
  b.   33.0°  
  c.   0.839°  
  d.   25.7°  
  Hint    
      
  5.What is the speed of light in a diamond (n = 2.42)?  
  a.   1.24 × 108 m/s  
  b.   2.42 × 108 m/s  
  c.   3.00 × 108 m/s  
  d.   7.26 × 108 m/s  
  Hint    
      
  6.What causes a mirage?  
  a.   water on the ground  
  b.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  c.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  d.   heatstroke  
  Hint    
      
  7.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   because optical fibers must use glass  
  b.   because a vacuum is too optically dense  
  c.   there is nothing for light to travel through  
  d.   there is nothing less optically dense than a vacuum  
  Hint    
      
  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.   0.709  
  b.   0.643  
  c.   1.20  
  d.   1.81  
  Hint    
      
  9.A ray of light striking perpendicular to an optically dense surface will __________.  
  a.   remain straight  
  b.   refract away from the normal  
  c.   refract toward the normal  
  d.   reflect  
  Hint    
      
  10.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   in the center of the rainbow  
  b.   behind you  
  c.   in front of you  
  d.   directly overhead  
  Hint    

 
   
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