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Chapter 17: Reflection and Refraction

Practice Test
  1.A ray of light striking perpendicular to an optically dense surface will __________.  
  a.   remain straight  
  b.   reflect  
  c.   refract toward the normal  
  d.   refract away from the normal  
  2.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  
  3.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   travel at the same speed  
  b.   stop completely  
  c.   slow down  
  d.   speed up  
  4.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.   1.20  
  b.   0.709  
  c.   1.81  
  d.   0.643  
  5.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   hours before  
  c.   after  
  d.   before  
  6.What is dispersion?  
  a.   the separation of light into its spectrum  
  b.   the combining of colored light into white light  
  c.   the refraction of light  
  d.   the reflection of colored light  
  7.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  
  8.Through which medium is the speed of light the fastest?  
  a.   vacuum  
  b.   glass  
  c.   air  
  d.   water  
  9.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 diffused  
  b.   it is refracted  
  c.   it is reflected  
  d.   it is stopped  
  10.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.   1.66  
  c.   0.985  
  d.   1.12  

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