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Chapter 17: Reflection and Refraction

Practice Test
      
  1.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 stopped  
  b.   it is diffused  
  c.   it is reflected  
  d.   it is refracted  
  Hint    
      
  2.What is dispersion?  
  a.   the refraction of light  
  b.   the combining of colored light into white light  
  c.   the reflection of colored light  
  d.   the separation of light into its spectrum  
  Hint    
      
  3.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   incident  
  b.   refracted  
  c.   pure  
  d.   reflected  
  Hint    
      
  4.How does light normally travel?  
  a.   in concentric circles  
  b.   in a curved line  
  c.   in a straight line  
  d.   always toward a dark area  
  Hint    
      
  5.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   hours before  
  b.   at the same time as  
  c.   after  
  d.   before  
  Hint    
      
  6.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   speed up  
  b.   stop completely  
  c.   slow down  
  d.   travel at the same speed  
  Hint    
      
  7.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.   1.81  
  c.   0.709  
  d.   1.20  
  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 air  
  b.   the same as the speed of light in a vacuum  
  c.   slower than the speed of light in air  
  d.   faster than the speed of light in air  
  Hint    
      
  9.What does Snell's law compare?  
  a.   the cosines of the refracted angles  
  b.   the sines of the refracted angles  
  c.   the reflective nature of materials  
  d.   the density of the materials  
  Hint    
      
  10.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a lower frequency  
  b.   a longer wavelength  
  c.   a faster speed  
  d.   a shorter wavelength  
  Hint    

 
   
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