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Chapter 18: Mirrors and Lenses

Practice Test
  1.An image of a flower is seen through a lens. What is the object?  
  a.   a lens  
  b.   an image  
  c.   a flower  
  d.   a mirror  
  2.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the center of the mirror  
  c.   the location of the object  
  d.   the focal point  
  3.The refractive indices of lenses are __________.  
  a.   less than air  
  b.   the same as air  
  c.   independent of the refractive index of air  
  d.   greater than air  
  4.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only convex  
  c.   Only concave  
  d.   All  
  5.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   1/2  
  b.   2  
  c.   10  
  d.   20  
  6.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A real image  
  c.   The object  
  d.   A ray  
  7.The distance from the focal point to the mirror is the __________.  
  a.   foci  
  b.   focal distance  
  c.   focal length  
  d.   focus point  
  8.An achromatic lens corrects chromatic aberration using __________.  
  a.   no lenses  
  b.   two concave lenses with the same index of refraction  
  c.   a combination of concave and convex lenses with different indices of refraction  
  d.   two convex lenses with the same index of refraction  
  9.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   real  
  c.   convex  
  d.   virtual  
  10.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   reduced  
  d.   positive  

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