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Chapter 17: Reflection and Refraction

Practice Test
  1.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   before  
  c.   hours before  
  d.   after  
  2.A beam of light travels through air (n = 1.0003) and strikes an unknown material at an angle of 50.0°. The new angle of refraction is 25.0°. What is the index of refraction of this material?  
  a.   0.709  
  b.   1.20  
  c.   0.643  
  d.   1.81  
  3.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   reflected  
  b.   incident  
  c.   refracted  
  d.   pure  
  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.   1.12  
  b.   1.66  
  c.   0.985  
  d.   2.00  
  5.If a refracted ray moves away from the normal, the speed of light of the ray in this material is __________ that of the incident ray.  
  a.   greater than  
  b.   the same as  
  c.   unrelated to  
  d.   less than  
  6.How does light normally travel?  
  a.   in a curved line  
  b.   in a straight line  
  c.   always toward a dark area  
  d.   in concentric circles  
  7.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   faster than the speed of light in air  
  b.   the same as the speed of light in air  
  c.   slower than the speed of light in air  
  d.   the same as the speed of light in a vacuum  
  8.Through which medium is the speed of light the fastest?  
  a.   glass  
  b.   water  
  c.   vacuum  
  d.   air  
  9.What happens to light during total internal reflection?  
  a.   The angle of refraction is less than the critical angle.  
  b.   The angle of reflection is the same as the critical angle.  
  c.   The angle of incidence is 0.  
  d.   The angle of incidence is greater than the critical angle.  
  10.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.   0.433°  
  b.   0.839°  
  c.   25.7°  
  d.   33.0°  

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