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Chapter 18: Mirrors and Lenses

Practice Test
  1.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  
  2.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   in front of the mirror  
  b.   behind you  
  c.   behind the mirror  
  d.   between you and the mirror  
  3.The image produced by the ocular of a microscope is a(n) __________.  
  a.   virtual image  
  b.   object image  
  c.   real image  
  d.   reflected image  
  4.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   convex  
  c.   real  
  d.   critical  
  5.The distance from the focal point to the mirror is the __________.  
  a.   foci  
  b.   focal distance  
  c.   focus point  
  d.   focal length  
  6.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  
  7.In nearsightedness, the image is focused __________.  
  a.   beyond the retina  
  b.   in front of the eye  
  c.   directly on the retina  
  d.   in front of the retina  
  8.Spherical aberration can be avoided by using a __________.  
  a.   convex mirror  
  b.   plane mirror  
  c.   spherical mirror  
  d.   parabolic mirror  
  9.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and mirror  
  b.   twice the distance of the focal point  
  c.   between the focal point and twice the distance of the focal point  
  d.   past the focal point  
  10.The image from a convex mirror will _________.  
  a.   always be projected  
  b.   always be virtual  
  c.   never be virtual  
  d.   always be real  

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