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Chapter 18: Mirrors and Lenses

Practice Test
  1.The focal length of a concave lens is __________.  
  a.   negative  
  b.   positive  
  c.   reduced  
  d.   magnified  
  2.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.   2.0 m  
  b.   1.3 m  
  c.   4.0 m  
  d.   0.67 m  
  3.What does the F on a ray diagram represent?  
  a.   the center of the mirror  
  b.   the focal point  
  c.   the location of the object  
  d.   the location of the virtual image  
  4.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind you  
  b.   behind the mirror  
  c.   in front of the mirror  
  d.   between you and the mirror  
  5.A __________ image is formed when light rays converge and pass through the image.  
  a.   convex  
  b.   real  
  c.   virtual  
  d.   critical  
  6.__________ single lenses have chromatic aberration  
  a.   Only concave  
  b.   Only parabolic  
  c.   Only convex  
  d.   All  
  7.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   virtual image  
  c.   object image  
  d.   reflected image  
  8.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   twice the distance of the focal point  
  b.   between the focal point and mirror  
  c.   between the focal point and twice the distance of the focal point  
  d.   past the focal point  
  9.Spherical aberration can be avoided by using a __________.  
  a.   plane mirror  
  b.   convex mirror  
  c.   parabolic mirror  
  d.   spherical mirror  
  10.Why are bigger lenses better for observing dim objects?  
  a.   they refract light less  
  b.   they have better curvatures  
  c.   they reduce spherical aberration  
  d.   they collect more light  

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