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Chapter 18: Mirrors and Lenses

Practice Test
  1.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they refract light less  
  c.   they collect more light  
  d.   they reduce spherical aberration  
  2.An image of a flower is seen through a lens. What is the object?  
  a.   a lens  
  b.   an image  
  c.   a flower  
  d.   a mirror  
  3.The distance from the focal point to the mirror is the __________.  
  a.   focal length  
  b.   focal distance  
  c.   focus point  
  d.   foci  
  4.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  
  5.Real images produced by mirrors have __________ magnification.  
  a.   positive  
  b.   massive  
  c.   opposite  
  d.   negative  
  6.The image from a convex mirror will _________.  
  a.   always be real  
  b.   always be projected  
  c.   always be virtual  
  d.   never be virtual  
  7.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.   1.3 m  
  b.   4.0 m  
  c.   2.0 m  
  d.   0.67 m  
  8.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   many focal points  
  c.   no focal points  
  d.   two focal points  
  9.Spherical aberration can be avoided by using a __________.  
  a.   plane mirror  
  b.   convex mirror  
  c.   spherical mirror  
  d.   parabolic mirror  
  10.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A ray  
  c.   The object  
  d.   A real image  

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