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Chapter 17: Reflection and Refraction

Practice Test
  1.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by electrical impulses  
  c.   by different colors  
  d.   by light  
  2.A ray of light striking perpendicular to an optically dense surface will __________.  
  a.   reflect  
  b.   refract away from the normal  
  c.   remain straight  
  d.   refract toward the normal  
  3.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a longer wavelength  
  b.   a faster speed  
  c.   a shorter wavelength  
  d.   a lower frequency  
  4.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.   1.66  
  b.   2.00  
  c.   1.12  
  d.   0.985  
  5.What happens to light during total internal reflection?  
  a.   The angle of incidence is 0.  
  b.   The angle of incidence is greater than the critical angle.  
  c.   The angle of refraction is less than the critical angle.  
  d.   The angle of reflection is the same as the critical angle.  
  6.Through which medium is the speed of light the fastest?  
  a.   vacuum  
  b.   water  
  c.   air  
  d.   glass  
  7.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   refracted  
  b.   pure  
  c.   incident  
  d.   reflected  
  8.What is the purpose of cladding in an optical fiber?  
  a.   prevents scattering of light  
  b.   causes total internal reflection  
  c.   prevents reflection  
  d.   reduces refraction  
  9.How does light normally travel?  
  a.   in a curved line  
  b.   always toward a dark area  
  c.   in a straight line  
  d.   in concentric circles  
  10.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   in front of you  
  b.   in the center of the rainbow  
  c.   behind you  
  d.   directly overhead  

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