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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.   the same as the speed of light in air  
  b.   faster than the speed of light in air  
  c.   the same as the speed of light in a vacuum  
  d.   slower than the speed of light in air  
  2.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 diffused  
  c.   it is stopped  
  d.   it is refracted  
  3.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   in the center of the rainbow  
  b.   in front of you  
  c.   behind you  
  d.   directly overhead  
  4.What is the purpose of cladding in an optical fiber?  
  a.   prevents reflection  
  b.   prevents scattering of light  
  c.   reduces refraction  
  d.   causes total internal reflection  
  5.The line perpendicular to the reflective surface is the __________.  
  a.   line of refraction  
  b.   normal  
  c.   line of incidence  
  d.   line of reflection  
  6.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  
  7.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   before  
  c.   after  
  d.   hours before  
  8.How does light normally travel?  
  a.   always toward a dark area  
  b.   in a straight line  
  c.   in a curved line  
  d.   in concentric circles  
  9.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.   1.66  
  b.   1.12  
  c.   2.00  
  d.   0.985  
  10.What does Snell's law compare?  
  a.   the cosines of the refracted angles  
  b.   the sines of the refracted angles  
  c.   the density of the materials  
  d.   the reflective nature of materials  

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