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Chapter 18: Mirrors and Lenses

Practice Test
  1.The refractive indices of lenses are __________.  
  a.   greater than air  
  b.   the same as air  
  c.   less than air  
  d.   independent of the refractive index of air  
  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.   0.67 m  
  b.   4.0 m  
  c.   2.0 m  
  d.   1.3 m  
  3.What does the F on a ray diagram represent?  
  a.   the center of the mirror  
  b.   the location of the virtual image  
  c.   the location of the object  
  d.   the focal point  
  4.Farsightedness can be corrected with a __________.  
  a.   plane lens  
  b.   concave lens  
  c.   convex lens  
  d.   parabolic lens  
  5.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they collect more light  
  c.   they refract light less  
  d.   they reduce spherical aberration  
  6.The image from a convex mirror will _________.  
  a.   never be virtual  
  b.   always be virtual  
  c.   always be real  
  d.   always be projected  
  7.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   one focal point  
  c.   many focal points  
  d.   no focal points  
  8.The focal length of a concave lens is __________.  
  a.   reduced  
  b.   magnified  
  c.   negative  
  d.   positive  
  9.__________ single lenses have chromatic aberration  
  a.   Only convex  
  b.   All  
  c.   Only parabolic  
  d.   Only concave  
  10.__________ is located behind a convex mirror.  
  a.   A ray  
  b.   A real image  
  c.   The object  
  d.   The focal point  

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