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Chapter 18: Mirrors and Lenses

Practice Test
  1.Spherical aberration can be avoided by using a __________.  
  a.   convex mirror  
  b.   parabolic mirror  
  c.   spherical mirror  
  d.   plane mirror  
  2.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   a flower  
  c.   an image  
  d.   a lens  
  3.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   real  
  c.   convex  
  d.   critical  
  4.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.   4.0 m  
  b.   2.0 m  
  c.   1.3 m  
  d.   0.67 m  
  5.An achromatic lens corrects chromatic aberration using __________.  
  a.   two concave lenses with the same index of refraction  
  b.   a combination of concave and convex lenses with different indices of refraction  
  c.   no lenses  
  d.   two convex lenses with the same index of refraction  
  6.Farsightedness can be corrected with a __________.  
  a.   plane lens  
  b.   convex lens  
  c.   concave lens  
  d.   parabolic lens  
  7.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind the mirror  
  b.   between you and the mirror  
  c.   in front of the mirror  
  d.   behind you  
  8.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   many focal points  
  c.   two focal points  
  d.   no focal points  
  9.Why are bigger lenses better for observing dim objects?  
  a.   they collect more light  
  b.   they have better curvatures  
  c.   they refract light less  
  d.   they reduce spherical aberration  
  10.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   foci  
  c.   focus point  
  d.   focal distance  

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