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Chapter 17: Reflection and Refraction

Practice Test
  1.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.   slower than the speed of light in air  
  c.   the same as the speed of light in a vacuum  
  d.   the same as the speed of light in air  
  2.What happens to light during total internal reflection?  
  a.   The angle of incidence is 0.  
  b.   The angle of incidence is greater than the critical angle.  
  c.   The angle of reflection is the same as the critical angle.  
  d.   The angle of refraction is less than the critical angle.  
  3.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.   0.643  
  c.   1.81  
  d.   1.20  
  4.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   behind you  
  b.   in front of you  
  c.   in the center of the rainbow  
  d.   directly overhead  
  5.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 reflected  
  b.   it is stopped  
  c.   it is diffused  
  d.   it is refracted  
  6.The line perpendicular to the reflective surface is the __________.  
  a.   line of incidence  
  b.   line of reflection  
  c.   line of refraction  
  d.   normal  
  7.Your image in a bathroom mirror results from __________.  
  a.   diffuse reflection  
  b.   regular refraction  
  c.   diffuse refraction  
  d.   regular reflection  
  8.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   after  
  b.   hours before  
  c.   before  
  d.   at the same time as  
  9.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.   reflected angle  
  d.   refracted angle  
  10.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.   unrelated to  
  b.   greater than  
  c.   less than  
  d.   the same as  

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