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Chapter 17: Reflection and Refraction

Practice Test
  1.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.   1.12  
  c.   0.985  
  d.   1.66  
  2.How is information carried in an optical fiber?  
  a.   by light  
  b.   by electrical impulses  
  c.   by different colors  
  d.   by sound  
  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  
  4.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   refracted  
  b.   reflected  
  c.   pure  
  d.   incident  
  5.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   directly overhead  
  b.   in front of you  
  c.   behind you  
  d.   in the center of the rainbow  
  6.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   before  
  b.   at the same time as  
  c.   hours before  
  d.   after  
  7.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   reflected angle  
  b.   critical angle  
  c.   normal angle  
  d.   refracted angle  
  8.The line perpendicular to the reflective surface is the __________.  
  a.   line of incidence  
  b.   line of reflection  
  c.   normal  
  d.   line of refraction  
  9.Through which medium is the speed of light the fastest?  
  a.   vacuum  
  b.   glass  
  c.   air  
  d.   water  
  10.What causes a mirage?  
  a.   water on the ground  
  b.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  c.   heatstroke  
  d.   a continuous change in the index of refraction of air because n decreases as air gets warmer  

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