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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.A concave lens is also known as a __________ lens.  
  a.   concave  
  b.   converging  
  c.   diverging  
  d.   plane  
  Hint    
      
  2.Why are bigger lenses better for observing dim objects?  
  a.   they reduce spherical aberration  
  b.   they have better curvatures  
  c.   they collect more light  
  d.   they refract light less  
  Hint    
      
  3.What does the F on a ray diagram represent?  
  a.   the center of the mirror  
  b.   the location of the virtual image  
  c.   the focal point  
  d.   the location of the object  
  Hint    
      
  4.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   parabolic mirror  
  c.   convex mirror  
  d.   plane mirror  
  Hint    
      
  5.The focal length of a concave lens is __________.  
  a.   reduced  
  b.   positive  
  c.   magnified  
  d.   negative  
  Hint    
      
  6.In nearsightedness, the image is focused __________.  
  a.   in front of the eye  
  b.   directly on the retina  
  c.   beyond the retina  
  d.   in front of the retina  
  Hint    
      
  7.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   10  
  b.   2  
  c.   1/2  
  d.   20  
  Hint    
      
  8.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.   0.67 m  
  c.   1.3 m  
  d.   4.0 m  
  Hint    
      
  9.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   plane  
  b.   concave  
  c.   convex  
  d.   diffuse  
  Hint    
      
  10.Real images produced by mirrors have __________ magnification.  
  a.   positive  
  b.   massive  
  c.   opposite  
  d.   negative  
  Hint    

 
   
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