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Chapter 17: Reflection and Refraction

Practice Test
  1.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.   0.839°  
  c.   25.7°  
  d.   0.433°  
  2.Through which medium is the speed of light the fastest?  
  a.   water  
  b.   glass  
  c.   vacuum  
  d.   air  
  3.What causes a mirage?  
  a.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  b.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  c.   heatstroke  
  d.   water on the ground  
  4.What is dispersion?  
  a.   the combining of colored light into white light  
  b.   the separation of light into its spectrum  
  c.   the refraction of light  
  d.   the reflection of colored light  
  5.What is the speed of light in a diamond (n = 2.42)?  
  a.   1.24 × 108 m/s  
  b.   2.42 × 108 m/s  
  c.   7.26 × 108 m/s  
  d.   3.00 × 108 m/s  
  6.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing for light to travel through  
  b.   because a vacuum is too optically dense  
  c.   there is nothing less optically dense than a vacuum  
  d.   because optical fibers must use glass  
  7.Your image in a bathroom mirror results from __________.  
  a.   regular reflection  
  b.   regular refraction  
  c.   diffuse refraction  
  d.   diffuse reflection  
  8.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   pure  
  b.   reflected  
  c.   incident  
  d.   refracted  
  9.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   in front of you  
  b.   behind you  
  c.   directly overhead  
  d.   in the center of the rainbow  
  10.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   travel at the same speed  
  c.   slow down  
  d.   speed up  

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