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Chapter 17: Reflection and Refraction

Practice Test
  1.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   normal angle  
  b.   refracted angle  
  c.   reflected angle  
  d.   critical angle  
  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 refracted  
  b.   it is diffused  
  c.   it is stopped  
  d.   it is reflected  
  3.What causes a mirage?  
  a.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  b.   heatstroke  
  c.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  d.   water on the ground  
  4.What is dispersion?  
  a.   the combining of colored light into white light  
  b.   the separation of light into its spectrum  
  c.   the refraction of light  
  d.   the reflection of colored light  
  5.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.   the same as  
  c.   greater than  
  d.   less than  
  6.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   hours before  
  b.   before  
  c.   after  
  d.   at the same time as  
  7.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  
  8.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   the same as the speed of light in a vacuum  
  b.   faster than the speed of light in air  
  c.   slower than the speed of light in air  
  d.   the same as the speed of light in air  
  9.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   slow down  
  c.   speed up  
  d.   travel at the same speed  
  10.The line perpendicular to the reflective surface is the __________.  
  a.   normal  
  b.   line of incidence  
  c.   line of refraction  
  d.   line of reflection  

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