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Chapter 17: Reflection and Refraction

Practice Test
  1.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   directly overhead  
  b.   behind you  
  c.   in the center of the rainbow  
  d.   in front of you  
  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 diffused  
  b.   it is refracted  
  c.   it is reflected  
  d.   it is stopped  
  3.What is dispersion?  
  a.   the refraction of light  
  b.   the combining of colored light into white light  
  c.   the separation of light into its spectrum  
  d.   the reflection of colored light  
  4.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.   less than  
  c.   greater than  
  d.   the same as  
  5.Your image in a bathroom mirror results from __________.  
  a.   diffuse refraction  
  b.   regular reflection  
  c.   diffuse reflection  
  d.   regular refraction  
  6.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.   0.433°  
  b.   33.0°  
  c.   0.839°  
  d.   25.7°  
  7.The line perpendicular to the reflective surface is the __________.  
  a.   normal  
  b.   line of incidence  
  c.   line of reflection  
  d.   line of refraction  
  8.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   stop completely  
  b.   speed up  
  c.   travel at the same speed  
  d.   slow down  
  9.How does light normally travel?  
  a.   in a curved line  
  b.   in a straight line  
  c.   always toward a dark area  
  d.   in concentric circles  
  10.A ray of light striking perpendicular to an optically dense surface will __________.  
  a.   reflect  
  b.   remain straight  
  c.   refract away from the normal  
  d.   refract toward the normal  

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