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Chapter 18: Mirrors and Lenses

Practice Test
  1.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the center of the mirror  
  c.   the focal point  
  d.   the location of the object  
  2.The refractive indices of lenses are __________.  
  a.   independent of the refractive index of air  
  b.   less than air  
  c.   the same as air  
  d.   greater than air  
  3.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   diffuse  
  b.   concave  
  c.   convex  
  d.   plane  
  4.__________ is located behind a convex mirror.  
  a.   A real image  
  b.   A ray  
  c.   The object  
  d.   The focal point  
  5.An image of a flower is seen through a lens. What is the object?  
  a.   a flower  
  b.   an image  
  c.   a mirror  
  d.   a lens  
  6.An achromatic lens corrects chromatic aberration using __________.  
  a.   two concave lenses with the same index of refraction  
  b.   two convex lenses with the same index of refraction  
  c.   no lenses  
  d.   a combination of concave and convex lenses with different indices of refraction  
  7.The distance from the focal point to the mirror is the __________.  
  a.   focal distance  
  b.   focal length  
  c.   focus point  
  d.   foci  
  8.The image from a convex mirror will _________.  
  a.   always be real  
  b.   never be virtual  
  c.   always be projected  
  d.   always be virtual  
  9.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   twice the distance of the focal point  
  b.   past the focal point  
  c.   between the focal point and twice the distance of the focal point  
  d.   between the focal point and mirror  
  10.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   focal point  
  b.   object  
  c.   lens edge  
  d.   image  

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