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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 lower frequency  
  b.   a faster speed  
  c.   a shorter wavelength  
  d.   a longer wavelength  
  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.How does light normally travel?  
  a.   always toward a dark area  
  b.   in concentric circles  
  c.   in a straight line  
  d.   in a curved line  
  Hint    
      
  4.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.   1.81  
  b.   0.709  
  c.   1.20  
  d.   0.643  
  Hint    
      
  5.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   speed up  
  c.   slow down  
  d.   travel at the same speed  
  Hint    
      
  6.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   reflected  
  b.   refracted  
  c.   pure  
  d.   incident  
  Hint    
      
  7.What does Snell's law compare?  
  a.   the reflective nature of materials  
  b.   the cosines of the refracted angles  
  c.   the sines of the refracted angles  
  d.   the density of the materials  
  Hint    
      
  8.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    
      
  9.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    
      
  10.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing for light to travel through  
  b.   because optical fibers must use glass  
  c.   there is nothing less optically dense than a vacuum  
  d.   because a vacuum is too optically dense  
  Hint    

 
   
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