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Chapter 17: Reflection and Refraction

Practice Test
  1.What is the speed of light in a diamond (n = 2.42)?  
  a.   1.24 × 108 m/s  
  b.   3.00 × 108 m/s  
  c.   2.42 × 108 m/s  
  d.   7.26 × 108 m/s  
  2.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   hours before  
  b.   after  
  c.   at the same time as  
  d.   before  
  3.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.   0.839°  
  b.   33.0°  
  c.   25.7°  
  d.   0.433°  
  4.The line perpendicular to the reflective surface is the __________.  
  a.   line of reflection  
  b.   line of refraction  
  c.   normal  
  d.   line of incidence  
  5.What does Snell's law compare?  
  a.   the cosines of the refracted angles  
  b.   the reflective nature of materials  
  c.   the density of the materials  
  d.   the sines of the refracted angles  
  6.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   slower than 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.   the same as the speed of light in air  
  7.Your image in a bathroom mirror results from __________.  
  a.   diffuse reflection  
  b.   regular refraction  
  c.   diffuse refraction  
  d.   regular reflection  
  8.How is information carried in an optical fiber?  
  a.   by light  
  b.   by sound  
  c.   by different colors  
  d.   by electrical impulses  
  9.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   prevents reflection  
  c.   prevents scattering of light  
  d.   reduces refraction  
  10.What is dispersion?  
  a.   the combining of colored light into white light  
  b.   the reflection of colored light  
  c.   the separation of light into its spectrum  
  d.   the refraction of light  

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