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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.An achromatic lens corrects chromatic aberration using __________.  
  a.   two concave lenses with the same index of refraction  
  b.   a combination of concave and convex lenses with different indices of refraction  
  c.   no lenses  
  d.   two convex lenses with the same index of refraction  
  Hint    
      
  2.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    
      
  3.A concave lens is also known as a __________ lens.  
  a.   concave  
  b.   plane  
  c.   diverging  
  d.   converging  
  Hint    
      
  4.An image of a flower is seen through a lens. What is the object?  
  a.   a flower  
  b.   a mirror  
  c.   a lens  
  d.   an image  
  Hint    
      
  5.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 converge and form a real image  
  c.   converge and sight lines diverge and form a virtual image  
  d.   diverge and sight lines diverge and form a real image  
  Hint    
      
  6.The distance from the focal point to the mirror is the __________.  
  a.   foci  
  b.   focus point  
  c.   focal distance  
  d.   focal length  
  Hint    
      
  7.The image from a convex mirror will _________.  
  a.   always be real  
  b.   always be projected  
  c.   never be virtual  
  d.   always be virtual  
  Hint    
      
  8.The focal length of a concave lens is __________.  
  a.   reduced  
  b.   negative  
  c.   magnified  
  d.   positive  
  Hint    
      
  9.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   convex mirror  
  c.   parabolic mirror  
  d.   plane mirror  
  Hint    
      
  10.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   real  
  c.   critical  
  d.   convex  
  Hint    

 
   
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