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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they refract light less  
  c.   they collect more light  
  d.   they reduce spherical aberration  
  Hint    
      
  2.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   The object  
  c.   A ray  
  d.   A real image  
  Hint    
      
  3.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.   between the focal point and mirror  
  c.   twice the distance of the focal point  
  d.   past the focal point  
  Hint    
      
  4.A concave lens is also known as a __________ lens.  
  a.   concave  
  b.   diverging  
  c.   plane  
  d.   converging  
  Hint    
      
  5.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind the mirror  
  b.   between you and the mirror  
  c.   in front of the mirror  
  d.   behind you  
  Hint    
      
  6.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   image  
  b.   lens edge  
  c.   focal point  
  d.   object  
  Hint    
      
  7.The refractive indices of lenses are __________.  
  a.   the same as air  
  b.   less than air  
  c.   independent of the refractive index of air  
  d.   greater than air  
  Hint    
      
  8.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    
      
  9.__________ single lenses have chromatic aberration  
  a.   Only convex  
  b.   Only concave  
  c.   Only parabolic  
  d.   All  
  Hint    
      
  10.The focal length of a concave lens is __________.  
  a.   reduced  
  b.   negative  
  c.   positive  
  d.   magnified  
  Hint    

 
   
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