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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   no focal points  
  c.   two focal points  
  d.   many focal points  
  Hint    
      
  2.In nearsightedness, the image is focused __________.  
  a.   in front of the retina  
  b.   in front of the eye  
  c.   beyond the retina  
  d.   directly on 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.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   independent of the refractive index of air  
  c.   the same as air  
  d.   less than air  
  Hint    
      
  5.An achromatic lens corrects chromatic aberration using __________.  
  a.   two convex lenses with the same index of refraction  
  b.   two concave lenses with the same index of refraction  
  c.   no lenses  
  d.   a combination of concave and convex lenses with different indices of refraction  
  Hint    
      
  6.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   1/2  
  c.   20  
  d.   10  
  Hint    
      
  7.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind you  
  b.   in front of the mirror  
  c.   behind the mirror  
  d.   between you and the mirror  
  Hint    
      
  8.When an object is placed between the focal point and a concave mirror, the rays __________.  
  a.   diverge and sight lines diverge and form a real image  
  b.   diverge and sight lines converge and form a virtual image  
  c.   converge and sight lines diverge and form a virtual image  
  d.   converge and sight lines converge and form a real image  
  Hint    
      
  9.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    
      
  10.The image produced by the ocular of a microscope is a(n) __________.  
  a.   object image  
  b.   virtual image  
  c.   real image  
  d.   reflected image  
  Hint    

 
   
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