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Chapter 18: Mirrors and Lenses

Practice Test
  1.Farsightedness can be corrected with a __________.  
  a.   concave lens  
  b.   parabolic lens  
  c.   plane lens  
  d.   convex lens  
  2.A __________ image is formed when light rays converge and pass through the image.  
  a.   real  
  b.   critical  
  c.   convex  
  d.   virtual  
  3.Spherical aberration can be avoided by using a __________.  
  a.   parabolic mirror  
  b.   plane mirror  
  c.   spherical mirror  
  d.   convex mirror  
  4.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind you  
  b.   in front of the mirror  
  c.   behind the mirror  
  d.   between you and the mirror  
  5.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   object  
  b.   image  
  c.   lens edge  
  d.   focal point  
  6.An achromatic lens corrects chromatic aberration using __________.  
  a.   a combination of concave and convex lenses with different indices of refraction  
  b.   two convex lenses with the same index of refraction  
  c.   two concave lenses with the same index of refraction  
  d.   no lenses  
  7.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   foci  
  c.   focus point  
  d.   focal distance  
  8.In nearsightedness, the image is focused __________.  
  a.   directly on the retina  
  b.   in front of the retina  
  c.   beyond the retina  
  d.   in front of the eye  
  9.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and mirror  
  b.   past the focal point  
  c.   between the focal point and twice the distance of the focal point  
  d.   twice the distance of the focal point  
  10.The focal length of a concave lens is __________.  
  a.   reduced  
  b.   negative  
  c.   positive  
  d.   magnified  

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