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Chapter 18: Mirrors and Lenses

Practice Test
  1.In nearsightedness, the image is focused __________.  
  a.   in front of the retina  
  b.   directly on the retina  
  c.   in front of the eye  
  d.   beyond the retina  
  2.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only convex  
  c.   All  
  d.   Only concave  
  3.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.   0.67 m  
  b.   2.0 m  
  c.   4.0 m  
  d.   1.3 m  
  4.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and twice the distance of the focal point  
  b.   between the focal point and mirror  
  c.   past the focal point  
  d.   twice the distance of the focal point  
  5.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   object image  
  c.   reflected image  
  d.   virtual image  
  6.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   lens edge  
  b.   object  
  c.   focal point  
  d.   image  
  7.__________ is located behind a convex mirror.  
  a.   A real image  
  b.   A ray  
  c.   The object  
  d.   The focal point  
  8.What does the F on a ray diagram represent?  
  a.   the focal point  
  b.   the location of the virtual image  
  c.   the location of the object  
  d.   the center of the mirror  
  9.Farsightedness can be corrected with a __________.  
  a.   parabolic lens  
  b.   convex lens  
  c.   plane lens  
  d.   concave lens  
  10.The refractive indices of lenses are __________.  
  a.   independent of the refractive index of air  
  b.   greater than air  
  c.   the same as air  
  d.   less than air  

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