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Chapter 17: Reflection and Refraction

Practice Test
  1.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   before  
  b.   hours before  
  c.   at the same time as  
  d.   after  
  2.The line perpendicular to the reflective surface is the __________.  
  a.   line of reflection  
  b.   normal  
  c.   line of incidence  
  d.   line of refraction  
  3.What is dispersion?  
  a.   the combining of colored light into white light  
  b.   the separation of light into its spectrum  
  c.   the reflection of colored light  
  d.   the refraction of light  
  4.In relation to a rainbow that you are looking at, where is the Sun?  
  a.   in front of you  
  b.   behind you  
  c.   in the center of the rainbow  
  d.   directly overhead  
  5.How does light normally travel?  
  a.   in a curved line  
  b.   always toward a dark area  
  c.   in concentric circles  
  d.   in a straight line  
  6.What causes a mirage?  
  a.   water on the ground  
  b.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  c.   heatstroke  
  d.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  7.What happens to light during total internal reflection?  
  a.   The angle of incidence is greater than the critical angle.  
  b.   The angle of refraction is less than the critical angle.  
  c.   The angle of incidence is 0.  
  d.   The angle of reflection is the same as the critical angle.  
  8.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.   0.433°  
  c.   25.7°  
  d.   33.0°  
  9.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a shorter wavelength  
  b.   a longer wavelength  
  c.   a faster speed  
  d.   a lower frequency  
  10.What is the speed of light in a diamond (n = 2.42)?  
  a.   1.24 × 108 m/s  
  b.   2.42 × 108 m/s  
  c.   7.26 × 108 m/s  
  d.   3.00 × 108 m/s  

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