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Chapter 17: Reflection and Refraction

Practice Test
      
  1.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a shorter wavelength  
  b.   a longer wavelength  
  c.   a lower frequency  
  d.   a faster speed  
  Hint    
      
  2.Your image in a bathroom mirror results from __________.  
  a.   regular refraction  
  b.   diffuse refraction  
  c.   diffuse reflection  
  d.   regular reflection  
  Hint    
      
  3.What is dispersion?  
  a.   the refraction of light  
  b.   the reflection of colored light  
  c.   the combining of colored light into white light  
  d.   the separation of light into its spectrum  
  Hint    
      
  4.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   after  
  c.   before  
  d.   hours before  
  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.   slower than the speed of light in air  
  d.   faster than the speed of light in air  
  Hint    
      
  6.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.   less than  
  c.   the same as  
  d.   greater than  
  Hint    
      
  7.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.   0.985  
  b.   2.00  
  c.   1.66  
  d.   1.12  
  Hint    
      
  8.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   refracted  
  b.   incident  
  c.   reflected  
  d.   pure  
  Hint    
      
  9.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by different colors  
  c.   by electrical impulses  
  d.   by light  
  Hint    
      
  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 diffused  
  b.   it is stopped  
  c.   it is refracted  
  d.   it is reflected  
  Hint    

 
   
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