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Chapter 18: Mirrors and Lenses

Practice Test
  1.__________ single lenses have chromatic aberration  
  a.   All  
  b.   Only concave  
  c.   Only convex  
  d.   Only parabolic  
  2.The refractive indices of lenses are __________.  
  a.   the same as air  
  b.   less than air  
  c.   greater than air  
  d.   independent of the refractive index of air  
  3.An achromatic lens corrects chromatic aberration using __________.  
  a.   two convex lenses with the same index of refraction  
  b.   a combination of concave and convex lenses with different indices of refraction  
  c.   two concave lenses with the same index of refraction  
  d.   no lenses  
  4.__________ is located behind a convex mirror.  
  a.   A ray  
  b.   The object  
  c.   A real image  
  d.   The focal point  
  5.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   10  
  c.   1/2  
  d.   2  
  6.The image from a convex mirror will _________.  
  a.   always be virtual  
  b.   never be virtual  
  c.   always be real  
  d.   always be projected  
  7.A __________ image is formed when light rays converge and pass through the image.  
  a.   real  
  b.   virtual  
  c.   critical  
  d.   convex  
  8.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   an image  
  c.   a flower  
  d.   a lens  
  9.Spherical aberration can be avoided by using a __________.  
  a.   plane mirror  
  b.   spherical mirror  
  c.   parabolic mirror  
  d.   convex mirror  
  10.The distance from the focal point to the mirror is the __________.  
  a.   foci  
  b.   focus point  
  c.   focal length  
  d.   focal distance  

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