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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.What does the F on a ray diagram represent?  
  a.   the location of the object  
  b.   the focal point  
  c.   the location of the virtual image  
  d.   the center of the mirror  
  Hint    
      
  2.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   diffuse  
  Hint    
      
  3.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   the same as air  
  c.   less than air  
  d.   independent of the refractive index of air  
  Hint    
      
  4.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only concave  
  c.   Only convex  
  d.   All  
  Hint    
      
  5.The distance from the focal point to the mirror is the __________.  
  a.   focal distance  
  b.   focal length  
  c.   foci  
  d.   focus point  
  Hint    
      
  6.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   positive  
  d.   reduced  
  Hint    
      
  7.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   one focal point  
  c.   no focal points  
  d.   many focal points  
  Hint    
      
  8.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   lens edge  
  b.   object  
  c.   image  
  d.   focal point  
  Hint    
      
  9.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   10  
  b.   1/2  
  c.   20  
  d.   2  
  Hint    
      
  10.An image of a flower is seen through a lens. What is the object?  
  a.   a flower  
  b.   an image  
  c.   a mirror  
  d.   a lens  
  Hint    

 
   
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