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Chapter 17: Reflection and Refraction

Practice Test
  1.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a lower frequency  
  b.   a faster speed  
  c.   a longer wavelength  
  d.   a shorter wavelength  
  2.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°  
  3.What is the purpose of cladding in an optical fiber?  
  a.   prevents reflection  
  b.   reduces refraction  
  c.   causes total internal reflection  
  d.   prevents scattering of light  
  4.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   speed up  
  b.   stop completely  
  c.   slow down  
  d.   travel at the same speed  
  5.Through which medium is the speed of light the fastest?  
  a.   water  
  b.   glass  
  c.   air  
  d.   vacuum  
  6.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 reflected  
  c.   it is stopped  
  d.   it is refracted  
  7.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   hours before  
  b.   after  
  c.   before  
  d.   at the same time as  
  8.What does Snell's law compare?  
  a.   the reflective nature of materials  
  b.   the cosines of the refracted angles  
  c.   the density of the materials  
  d.   the sines of the refracted angles  
  9.A beam of light travels through air (n = 1.0003) and strikes an unknown material at an angle of 50.0°. The new angle of refraction is 25.0°. What is the index of refraction of this material?  
  a.   0.709  
  b.   1.81  
  c.   0.643  
  d.   1.20  
  10.What causes a mirage?  
  a.   water on the ground  
  b.   heatstroke  
  c.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  d.   a continuous change in the index of refraction of air because n decreases as air gets warmer  

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