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Chapter 18: Mirrors and Lenses

Practice Test
  1.In nearsightedness, the image is focused __________.  
  a.   in front of the eye  
  b.   directly on the retina  
  c.   in front of the retina  
  d.   beyond the retina  
  2.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   diverging  
  c.   plane  
  d.   concave  
  3.The focal length of a concave lens is __________.  
  a.   positive  
  b.   negative  
  c.   reduced  
  d.   magnified  
  4.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the focal point  
  c.   the center of the mirror  
  d.   the location of the object  
  5.The image from a convex mirror will _________.  
  a.   always be virtual  
  b.   always be real  
  c.   never be virtual  
  d.   always be projected  
  6.The distance from the focal point to the mirror is the __________.  
  a.   focal distance  
  b.   focus point  
  c.   foci  
  d.   focal length  
  7.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind you  
  b.   in front of the mirror  
  c.   between you and the mirror  
  d.   behind the mirror  
  8.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   20  
  c.   1/2  
  d.   10  
  9.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   real  
  c.   convex  
  d.   virtual  
  10.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A real image  
  c.   The object  
  d.   A ray  

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