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Chapter 18: Mirrors and Lenses

Practice Test
  1.Real images produced by mirrors have __________ magnification.  
  a.   negative  
  b.   positive  
  c.   massive  
  d.   opposite  
  2.A __________ image is formed when light rays converge and pass through the image.  
  a.   real  
  b.   virtual  
  c.   convex  
  d.   critical  
  3.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   object  
  b.   focal point  
  c.   image  
  d.   lens edge  
  4.The focal length of a concave lens is __________.  
  a.   magnified  
  b.   negative  
  c.   reduced  
  d.   positive  
  5.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   independent of the refractive index of air  
  c.   less than air  
  d.   the same as air  
  6.Farsightedness can be corrected with a __________.  
  a.   concave lens  
  b.   parabolic lens  
  c.   convex lens  
  d.   plane lens  
  7.The image from a convex mirror will _________.  
  a.   always be projected  
  b.   always be virtual  
  c.   never be virtual  
  d.   always be real  
  8.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  
  9.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   plane  
  c.   diverging  
  d.   concave  
  10.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   foci  
  c.   focal distance  
  d.   focus point  

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