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Chapter 17: Reflection and Refraction

Practice Test
  1.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   refracted  
  b.   incident  
  c.   pure  
  d.   reflected  
  2.What causes a mirage?  
  a.   water on the ground  
  b.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  c.   heatstroke  
  d.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  3.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  
  4.Your image in a bathroom mirror results from __________.  
  a.   regular reflection  
  b.   diffuse reflection  
  c.   diffuse refraction  
  d.   regular refraction  
  5.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.   33.0°  
  b.   0.433°  
  c.   25.7°  
  d.   0.839°  
  6.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   normal angle  
  b.   critical angle  
  c.   refracted angle  
  d.   reflected angle  
  7.Through which medium is the speed of light the fastest?  
  a.   vacuum  
  b.   glass  
  c.   air  
  d.   water  
  8.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 refracted  
  b.   it is stopped  
  c.   it is diffused  
  d.   it is reflected  
  9.The line perpendicular to the reflective surface is the __________.  
  a.   line of incidence  
  b.   line of refraction  
  c.   normal  
  d.   line of reflection  
  10.How is information carried in an optical fiber?  
  a.   by sound  
  b.   by light  
  c.   by different colors  
  d.   by electrical impulses  

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