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Chapter 17: Reflection and Refraction

Practice Test
      
  1.A ray of light striking perpendicular to an optically dense surface will __________.  
  a.   refract away from the normal  
  b.   refract toward the normal  
  c.   remain straight  
  d.   reflect  
  Hint    
      
  2.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.   1.20  
  b.   0.643  
  c.   0.709  
  d.   1.81  
  Hint    
      
  3.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.   less than  
  b.   the same as  
  c.   unrelated to  
  d.   greater than  
  Hint    
      
  4.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   after  
  b.   before  
  c.   at the same time as  
  d.   hours before  
  Hint    
      
  5.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  
  Hint    
      
  6.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   faster than the speed of light in air  
  b.   the same as the speed of light in air  
  c.   slower than the speed of light in air  
  d.   the same as the speed of light in a vacuum  
  Hint    
      
  7.What is the speed of light in a diamond (n = 2.42)?  
  a.   7.26 × 108 m/s  
  b.   1.24 × 108 m/s  
  c.   3.00 × 108 m/s  
  d.   2.42 × 108 m/s  
  Hint    
      
  8.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.  
  Hint    
      
  9.Blue light, which is bent more than red light in a prism, has __________.  
  a.   a lower frequency  
  b.   a longer wavelength  
  c.   a faster speed  
  d.   a shorter wavelength  
  Hint    
      
  10.The line perpendicular to the reflective surface is the __________.  
  a.   line of refraction  
  b.   line of reflection  
  c.   line of incidence  
  d.   normal  
  Hint    

 
   
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