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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   focal distance  
  c.   focus point  
  d.   foci  
  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.   plane  
  c.   convex  
  d.   diffuse  
  Hint    
      
  3.In nearsightedness, the image is focused __________.  
  a.   in front of the retina  
  b.   beyond the retina  
  c.   directly on the retina  
  d.   in front of the eye  
  Hint    
      
  4.The image from a convex mirror will _________.  
  a.   always be real  
  b.   never be virtual  
  c.   always be projected  
  d.   always be virtual  
  Hint    
      
  5.Unlike mirrors, lenses have __________.  
  a.   many focal points  
  b.   one focal point  
  c.   two focal points  
  d.   no focal points  
  Hint    
      
  6.The refractive indices of lenses are __________.  
  a.   less than air  
  b.   greater than air  
  c.   independent of the refractive index of air  
  d.   the same as air  
  Hint    
      
  7.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.   4.0 m  
  b.   0.67 m  
  c.   1.3 m  
  d.   2.0 m  
  Hint    
      
  8.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and mirror  
  b.   between the focal point and twice the distance of the focal point  
  c.   past the focal point  
  d.   twice the distance of the focal point  
  Hint    
      
  9.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.   diverge and sight lines converge and form a virtual image  
  c.   diverge and sight lines diverge and form a real image  
  d.   converge and sight lines converge and form a real image  
  Hint    
      
  10.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    

 
   
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