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Chapter 17: Reflection and Refraction

Practice Test
  1.What does Snell's law compare?  
  a.   the density of the materials  
  b.   the reflective nature of materials  
  c.   the cosines of the refracted angles  
  d.   the sines of the refracted angles  
  2.What causes a mirage?  
  a.   heatstroke  
  b.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  c.   water on the ground  
  d.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  3.The line perpendicular to the reflective surface is the __________.  
  a.   line of refraction  
  b.   line of reflection  
  c.   line of incidence  
  d.   normal  
  4.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  
  5.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a lower frequency  
  b.   a longer wavelength  
  c.   a shorter wavelength  
  d.   a faster speed  
  6.Through which medium is the speed of light the fastest?  
  a.   water  
  b.   vacuum  
  c.   air  
  d.   glass  
  7.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   speed up  
  b.   travel at the same speed  
  c.   slow down  
  d.   stop completely  
  8.How does light normally travel?  
  a.   in a straight line  
  b.   always toward a dark area  
  c.   in a curved line  
  d.   in concentric circles  
  9.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   reduces refraction  
  c.   prevents scattering of light  
  d.   prevents reflection  
  10.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   behind you  
  b.   directly overhead  
  c.   in front of you  
  d.   in the center of the rainbow  

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