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Chapter 17: Reflection and Refraction

Practice Test
  1.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  
  2.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing less optically dense than a vacuum  
  b.   because optical fibers must use glass  
  c.   there is nothing for light to travel through  
  d.   because a vacuum is too optically dense  
  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.   33.0°  
  b.   0.839°  
  c.   25.7°  
  d.   0.433°  
  4.Your image in a bathroom mirror results from __________.  
  a.   diffuse refraction  
  b.   regular reflection  
  c.   diffuse reflection  
  d.   regular refraction  
  5.Through which medium is the speed of light the fastest?  
  a.   water  
  b.   air  
  c.   vacuum  
  d.   glass  
  6.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   critical angle  
  b.   refracted angle  
  c.   reflected angle  
  d.   normal angle  
  7.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   prevents scattering of light  
  c.   prevents reflection  
  d.   reduces refraction  
  8.What does Snell's law compare?  
  a.   the density of the materials  
  b.   the cosines of the refracted angles  
  c.   the reflective nature of materials  
  d.   the sines of the refracted angles  
  9.How does light normally travel?  
  a.   always toward a dark area  
  b.   in concentric circles  
  c.   in a straight line  
  d.   in a curved line  
  10.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   slow down  
  b.   speed up  
  c.   stop completely  
  d.   travel at the same speed  

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