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Chapter 17: Reflection and Refraction

Practice Test
      
  1.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   prevents reflection  
  c.   reduces refraction  
  d.   prevents scattering of light  
  Hint    
      
  2.What is the speed of light in a diamond (n = 2.42)?  
  a.   3.00 × 108 m/s  
  b.   1.24 × 108 m/s  
  c.   2.42 × 108 m/s  
  d.   7.26 × 108 m/s  
  Hint    
      
  3.Your image in a bathroom mirror results from __________.  
  a.   diffuse reflection  
  b.   regular reflection  
  c.   regular refraction  
  d.   diffuse refraction  
  Hint    
      
  4.What causes a mirage?  
  a.   heatstroke  
  b.   water on the ground  
  c.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  d.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  Hint    
      
  5.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   the same as the speed of light in a vacuum  
  b.   the same as the speed of light in air  
  c.   faster than the speed of light in air  
  d.   slower than the speed of light in air  
  Hint    
      
  6.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by light  
  c.   by different colors  
  d.   by electrical impulses  
  Hint    
      
  7.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.   0.839°  
  c.   33.0°  
  d.   0.433°  
  Hint    
      
  8.The line perpendicular to the reflective surface is the __________.  
  a.   line of incidence  
  b.   line of reflection  
  c.   normal  
  d.   line of refraction  
  Hint    
      
  9.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a shorter wavelength  
  b.   a faster speed  
  c.   a longer wavelength  
  d.   a lower frequency  
  Hint    
      
  10.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   directly overhead  
  b.   behind you  
  c.   in the center of the rainbow  
  d.   in front of you  
  Hint    

 
   
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