Science Home Product Information Site Map Search Contact Us   Glencoe Online
Quizzes Quiz
 
Chapter 18: Mirrors and Lenses

Practice Test
      
  1.An image of a flower is seen through a lens. What is the object?  
  a.   a lens  
  b.   an image  
  c.   a flower  
  d.   a mirror  
  Hint    
      
  2.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the center of the mirror  
  c.   the location of the object  
  d.   the focal point  
  Hint    
      
  3.The refractive indices of lenses are __________.  
  a.   less than air  
  b.   the same as air  
  c.   independent of the refractive index of air  
  d.   greater than air  
  Hint    
      
  4.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only convex  
  c.   Only concave  
  d.   All  
  Hint    
      
  5.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   1/2  
  b.   2  
  c.   10  
  d.   20  
  Hint    
      
  6.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A real image  
  c.   The object  
  d.   A ray  
  Hint    
      
  7.The distance from the focal point to the mirror is the __________.  
  a.   foci  
  b.   focal distance  
  c.   focal length  
  d.   focus point  
  Hint    
      
  8.An achromatic lens corrects chromatic aberration using __________.  
  a.   no lenses  
  b.   two concave lenses with the same index of refraction  
  c.   a combination of concave and convex lenses with different indices of refraction  
  d.   two convex lenses with the same index of refraction  
  Hint    
      
  9.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   real  
  c.   convex  
  d.   virtual  
  Hint    
      
  10.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   reduced  
  d.   positive  
  Hint    

 
   
McGraw-Hill / Glencoe
The McGraw-Hill Companies