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Chapter 18: Mirrors and Lenses

Practice Test
  1.What does the F on a ray diagram represent?  
  a.   the location of the object  
  b.   the focal point  
  c.   the location of the virtual image  
  d.   the center of the mirror  
  2.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   diffuse  
  3.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   the same as air  
  c.   less than air  
  d.   independent of the refractive index of air  
  4.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only concave  
  c.   Only convex  
  d.   All  
  5.The distance from the focal point to the mirror is the __________.  
  a.   focal distance  
  b.   focal length  
  c.   foci  
  d.   focus point  
  6.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   positive  
  d.   reduced  
  7.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   one focal point  
  c.   no focal points  
  d.   many focal points  
  8.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   lens edge  
  b.   object  
  c.   image  
  d.   focal point  
  9.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   10  
  b.   1/2  
  c.   20  
  d.   2  
  10.An image of a flower is seen through a lens. What is the object?  
  a.   a flower  
  b.   an image  
  c.   a mirror  
  d.   a lens  

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