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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.The focal length of a concave lens is __________.  
  a.   negative  
  b.   reduced  
  c.   positive  
  d.   magnified  
  Hint    
      
  2.The refractive indices of lenses are __________.  
  a.   less than air  
  b.   the same as air  
  c.   independent of the refractive index of air  
  d.   greater than air  
  Hint    
      
  3.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   between you and the mirror  
  b.   in front of the mirror  
  c.   behind the mirror  
  d.   behind you  
  Hint    
      
  4.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only convex  
  c.   All  
  d.   Only concave  
  Hint    
      
  5.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   a flower  
  c.   an image  
  d.   a lens  
  Hint    
      
  6.When an object is placed between the focal point and a concave mirror, the rays __________.  
  a.   converge and sight lines diverge and form a virtual image  
  b.   converge and sight lines converge and form a real image  
  c.   diverge and sight lines diverge and form a real image  
  d.   diverge and sight lines converge and form a virtual image  
  Hint    
      
  7.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   twice the distance of the focal point  
  b.   between the focal point and mirror  
  c.   between the focal point and twice the distance of the focal point  
  d.   past the focal point  
  Hint    
      
  8.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   real  
  c.   critical  
  d.   convex  
  Hint    
      
  9.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   diverging  
  c.   concave  
  d.   plane  
  Hint    
      
  10.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   focal distance  
  c.   foci  
  d.   focus point  
  Hint    

 
   
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