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Chapter 18: Mirrors and Lenses

Practice Test
  1.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   The object  
  c.   A ray  
  d.   A real image  
  2.Why are bigger lenses better for observing dim objects?  
  a.   they refract light less  
  b.   they reduce spherical aberration  
  c.   they have better curvatures  
  d.   they collect more light  
  3.Unlike mirrors, lenses have __________.  
  a.   no focal points  
  b.   one focal point  
  c.   two focal points  
  d.   many focal points  
  4.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   critical  
  c.   real  
  d.   convex  
  5.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   reduced  
  d.   positive  
  6.Farsightedness can be corrected with a __________.  
  a.   parabolic lens  
  b.   convex lens  
  c.   plane lens  
  d.   concave lens  
  7.An achromatic lens corrects chromatic aberration using __________.  
  a.   a combination of concave and convex lenses with different indices of refraction  
  b.   no lenses  
  c.   two convex lenses with the same index of refraction  
  d.   two concave lenses with the same index of refraction  
  8.In nearsightedness, the image is focused __________.  
  a.   directly on the retina  
  b.   beyond the retina  
  c.   in front of the eye  
  d.   in front of the retina  
  9.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  
  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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