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Chapter 18: Mirrors and Lenses

Practice Test
  1.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   object  
  b.   lens edge  
  c.   focal point  
  d.   image  
  2.An achromatic lens corrects chromatic aberration using __________.  
  a.   no lenses  
  b.   a combination of concave and convex lenses with different indices of refraction  
  c.   two concave lenses with the same index of refraction  
  d.   two convex lenses with the same index of refraction  
  3.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   convex mirror  
  c.   plane mirror  
  d.   parabolic mirror  
  4.The refractive indices of lenses are __________.  
  a.   independent of the refractive index of air  
  b.   the same as air  
  c.   less than air  
  d.   greater than air  
  5.Real images produced by mirrors have __________ magnification.  
  a.   positive  
  b.   opposite  
  c.   negative  
  d.   massive  
  6.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   convex  
  b.   plane  
  c.   diffuse  
  d.   concave  
  7.In nearsightedness, the image is focused __________.  
  a.   in front of the retina  
  b.   beyond the retina  
  c.   directly on the retina  
  d.   in front of the eye  
  8.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   concave  
  c.   diverging  
  d.   plane  
  9.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   foci  
  c.   focal distance  
  d.   focus point  
  10.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   virtual  
  c.   real  
  d.   convex  

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