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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   in front of the mirror  
  b.   behind the mirror  
  c.   between you and the mirror  
  d.   behind you  
  Hint    
      
  2.In nearsightedness, the image is focused __________.  
  a.   in front of the eye  
  b.   beyond the retina  
  c.   directly on the retina  
  d.   in front of the retina  
  Hint    
      
  3.A __________ image is formed when light rays converge and pass through the image.  
  a.   real  
  b.   convex  
  c.   critical  
  d.   virtual  
  Hint    
      
  4.What is f if you have an object 2.0 m from the concave mirror, and the image is 4.0 m from the mirror?  
  a.   0.67 m  
  b.   2.0 m  
  c.   1.3 m  
  d.   4.0 m  
  Hint    
      
  5.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   object image  
  c.   virtual image  
  d.   reflected image  
  Hint    
      
  6.The refractive indices of lenses are __________.  
  a.   the same as air  
  b.   less than air  
  c.   greater than air  
  d.   independent of the refractive index of air  
  Hint    
      
  7.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   2  
  c.   1/2  
  d.   10  
  Hint    
      
  8.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   many focal points  
  c.   no focal points  
  d.   two focal points  
  Hint    
      
  9.A concave lens is also known as a __________ lens.  
  a.   plane  
  b.   concave  
  c.   converging  
  d.   diverging  
  Hint    
      
  10.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   image  
  b.   lens edge  
  c.   object  
  d.   focal point  
  Hint    

 
   
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