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Chapter 17: Reflection and Refraction

Practice Test
  1.How does light normally travel?  
  a.   in a curved line  
  b.   in concentric circles  
  c.   in a straight line  
  d.   always toward a dark area  
  2.What is the purpose of cladding in an optical fiber?  
  a.   prevents reflection  
  b.   causes total internal reflection  
  c.   prevents scattering of light  
  d.   reduces refraction  
  3.What does Snell's law compare?  
  a.   the sines of the refracted angles  
  b.   the reflective nature of materials  
  c.   the cosines of the refracted angles  
  d.   the density of the materials  
  4.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   at the same time as  
  b.   before  
  c.   after  
  d.   hours before  
  5.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.   25.7°  
  c.   33.0°  
  d.   0.433°  
  6.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a longer wavelength  
  b.   a lower frequency  
  c.   a faster speed  
  d.   a shorter wavelength  
  7.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 reflected  
  c.   it is stopped  
  d.   it is diffused  
  8.What causes a mirage?  
  a.   a continuous change in the index of refraction of air because n decreases as air gets warmer  
  b.   a continuous change in the index of refraction of air because n increases as air gets warmer  
  c.   water on the ground  
  d.   heatstroke  
  9.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  
  10.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   speed up  
  b.   travel at the same speed  
  c.   stop completely  
  d.   slow down  

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