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Chapter 18: Mirrors and Lenses

Practice Test
      
  1.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A ray  
  c.   A real image  
  d.   The object  
  Hint    
      
  2.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   concave  
  c.   plane  
  d.   diverging  
  Hint    
      
  3.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   positive  
  d.   reduced  
  Hint    
      
  4.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   1/2  
  c.   10  
  d.   20  
  Hint    
      
  5.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   a lens  
  c.   an image  
  d.   a flower  
  Hint    
      
  6.Farsightedness can be corrected with a __________.  
  a.   convex lens  
  b.   parabolic lens  
  c.   concave lens  
  d.   plane lens  
  Hint    
      
  7.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   no focal points  
  c.   many focal points  
  d.   two focal points  
  Hint    
      
  8.The image from a convex mirror will _________.  
  a.   always be virtual  
  b.   always be real  
  c.   always be projected  
  d.   never be virtual  
  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.   2.0 m  
  c.   1.3 m  
  d.   4.0 m  
  Hint    
      
  10.Why are bigger lenses better for observing dim objects?  
  a.   they collect more light  
  b.   they have better curvatures  
  c.   they refract light less  
  d.   they reduce spherical aberration  
  Hint    

 
   
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