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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   virtual  
  c.   convex  
  d.   real  
  Hint    
      
  2.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   reflected image  
  c.   object image  
  d.   virtual image  
  Hint    
      
  3.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   many focal points  
  c.   no focal points  
  d.   one focal point  
  Hint    
      
  4.When an object is placed between the focal point and a concave mirror, the rays __________.  
  a.   converge and sight lines converge and form a real image  
  b.   diverge and sight lines diverge and form a real image  
  c.   diverge and sight lines converge and form a virtual image  
  d.   converge and sight lines diverge and form a virtual image  
  Hint    
      
  5.The image from a convex mirror will _________.  
  a.   never be virtual  
  b.   always be virtual  
  c.   always be projected  
  d.   always be real  
  Hint    
      
  6.A concave lens is also known as a __________ lens.  
  a.   plane  
  b.   diverging  
  c.   converging  
  d.   concave  
  Hint    
      
  7.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and twice the distance of the focal point  
  b.   past the focal point  
  c.   between the focal point and mirror  
  d.   twice the distance of the focal point  
  Hint    
      
  8.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   plane mirror  
  c.   convex mirror  
  d.   parabolic mirror  
  Hint    
      
  9.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   independent of the refractive index of air  
  c.   less than air  
  d.   the same as air  
  Hint    
      
  10.The focal length of a concave lens is __________.  
  a.   positive  
  b.   reduced  
  c.   negative  
  d.   magnified  
  Hint    

 
   
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