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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   The object  
  c.   A ray  
  d.   A real image  
  Hint    
      
  2.Why are bigger lenses better for observing dim objects?  
  a.   they refract light less  
  b.   they reduce spherical aberration  
  c.   they have better curvatures  
  d.   they collect more light  
  Hint    
      
  3.Unlike mirrors, lenses have __________.  
  a.   no focal points  
  b.   one focal point  
  c.   two focal points  
  d.   many focal points  
  Hint    
      
  4.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   critical  
  c.   real  
  d.   convex  
  Hint    
      
  5.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   reduced  
  d.   positive  
  Hint    
      
  6.Farsightedness can be corrected with a __________.  
  a.   parabolic lens  
  b.   convex lens  
  c.   plane lens  
  d.   concave lens  
  Hint    
      
  7.An achromatic lens corrects chromatic aberration using __________.  
  a.   a combination of concave and convex lenses with different indices of refraction  
  b.   no lenses  
  c.   two convex lenses with the same index of refraction  
  d.   two concave lenses with the same index of refraction  
  Hint    
      
  8.In nearsightedness, the image is focused __________.  
  a.   directly on the retina  
  b.   beyond the retina  
  c.   in front of the eye  
  d.   in front of the retina  
  Hint    
      
  9.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.   0.67 m  
  b.   4.0 m  
  c.   2.0 m  
  d.   1.3 m  
  Hint    
      
  10.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   foci  
  c.   focus point  
  d.   focal distance  
  Hint    

 
   
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