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Chapter 17: Reflection and Refraction

Practice Test
  1.What is dispersion?  
  a.   the separation of light into its spectrum  
  b.   the reflection of colored light  
  c.   the combining of colored light into white light  
  d.   the refraction of light  
  2.Through which medium is the speed of light the fastest?  
  a.   water  
  b.   air  
  c.   vacuum  
  d.   glass  
  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.   1.12  
  c.   1.66  
  d.   0.985  
  4.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing for light to travel through  
  b.   because optical fibers must use glass  
  c.   there is nothing less optically dense than a vacuum  
  d.   because a vacuum is too optically dense  
  5.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  
  6.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.   25.7°  
  b.   0.839°  
  c.   0.433°  
  d.   33.0°  
  7.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   reflected  
  b.   pure  
  c.   incident  
  d.   refracted  
  8.Your image in a bathroom mirror results from __________.  
  a.   diffuse reflection  
  b.   diffuse refraction  
  c.   regular reflection  
  d.   regular refraction  
  9.How does light normally travel?  
  a.   in concentric circles  
  b.   always toward a dark area  
  c.   in a curved line  
  d.   in a straight line  
  10.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a shorter wavelength  
  b.   a lower frequency  
  c.   a faster speed  
  d.   a longer wavelength  

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