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Chapter 17: Reflection and Refraction

Practice Test
      
  1.What is the purpose of cladding in an optical fiber?  
  a.   prevents reflection  
  b.   prevents scattering of light  
  c.   causes total internal reflection  
  d.   reduces refraction  
  Hint    
      
  2.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    
      
  3.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.   2.00  
  b.   0.985  
  c.   1.66  
  d.   1.12  
  Hint    
      
  4.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   incident  
  b.   reflected  
  c.   refracted  
  d.   pure  
  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.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a faster speed  
  b.   a shorter wavelength  
  c.   a longer wavelength  
  d.   a lower frequency  
  Hint    
      
  7.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   behind you  
  b.   in front of you  
  c.   directly overhead  
  d.   in the center of the rainbow  
  Hint    
      
  8.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   hours before  
  c.   after  
  d.   before  
  Hint    
      
  9.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   travel at the same speed  
  b.   slow down  
  c.   speed up  
  d.   stop completely  
  Hint    
      
  10.What does Snell's law compare?  
  a.   the density of the materials  
  b.   the cosines of the refracted angles  
  c.   the reflective nature of materials  
  d.   the sines of the refracted angles  
  Hint    

 
   
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