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Chapter 17: Reflection and Refraction

Practice Test
      
  1.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   normal angle  
  b.   refracted angle  
  c.   reflected angle  
  d.   critical angle  
  Hint    
      
  2.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 refracted  
  b.   it is diffused  
  c.   it is stopped  
  d.   it is reflected  
  Hint    
      
  3.What causes a mirage?  
  a.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  b.   heatstroke  
  c.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  d.   water on the ground  
  Hint    
      
  4.What is dispersion?  
  a.   the combining of colored light into white light  
  b.   the separation of light into its spectrum  
  c.   the refraction of light  
  d.   the reflection of colored light  
  Hint    
      
  5.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.   unrelated to  
  b.   the same as  
  c.   greater than  
  d.   less than  
  Hint    
      
  6.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   hours before  
  b.   before  
  c.   after  
  d.   at the same time as  
  Hint    
      
  7.What is the purpose of cladding in an optical fiber?  
  a.   prevents reflection  
  b.   prevents scattering of light  
  c.   reduces refraction  
  d.   causes total internal reflection  
  Hint    
      
  8.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.   faster than the speed of light in air  
  c.   slower than the speed of light in air  
  d.   the same as the speed of light in air  
  Hint    
      
  9.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   slow down  
  c.   speed up  
  d.   travel at the same speed  
  Hint    
      
  10.The line perpendicular to the reflective surface is the __________.  
  a.   normal  
  b.   line of incidence  
  c.   line of refraction  
  d.   line of reflection  
  Hint    

 
   
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