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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.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.   2.0 m  
  b.   4.0 m  
  c.   0.67 m  
  d.   1.3 m  
  Hint    
      
  2.In nearsightedness, the image is focused __________.  
  a.   directly on the retina  
  b.   in front of the eye  
  c.   in front of the retina  
  d.   beyond the retina  
  Hint    
      
  3.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   lens edge  
  b.   image  
  c.   focal point  
  d.   object  
  Hint    
      
  4.When an object is placed between the focal point and a concave mirror, the rays __________.  
  a.   diverge and sight lines converge and form a virtual image  
  b.   converge and sight lines diverge 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    
      
  5.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   1/2  
  b.   20  
  c.   2  
  d.   10  
  Hint    
      
  6.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   two focal points  
  c.   many focal points  
  d.   no focal points  
  Hint    
      
  7.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they collect more light  
  c.   they reduce spherical aberration  
  d.   they refract light less  
  Hint    
      
  8.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    
      
  9.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   virtual image  
  c.   object image  
  d.   reflected image  
  Hint    
      
  10.What does the F on a ray diagram represent?  
  a.   the center of the mirror  
  b.   the focal point  
  c.   the location of the object  
  d.   the location of the virtual image  
  Hint    

 
   
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