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Chapter 18: Mirrors and Lenses

Practice Test
  1.Farsightedness can be corrected with a __________.  
  a.   plane lens  
  b.   convex lens  
  c.   concave lens  
  d.   parabolic lens  
  2.__________ single lenses have chromatic aberration  
  a.   Only concave  
  b.   All  
  c.   Only convex  
  d.   Only parabolic  
  3.What does the F on a ray diagram represent?  
  a.   the location of the object  
  b.   the center of the mirror  
  c.   the location of the virtual image  
  d.   the focal point  
  4.When an object is placed between the focal point and a concave mirror, the rays __________.  
  a.   converge and sight lines diverge and form a virtual image  
  b.   diverge and sight lines diverge and form a real image  
  c.   diverge and sight lines converge and form a virtual image  
  d.   converge and sight lines converge and form a real image  
  5.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  
  6.A __________ image is formed when light rays converge and pass through the image.  
  a.   critical  
  b.   real  
  c.   virtual  
  d.   convex  
  7.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   image  
  b.   lens edge  
  c.   object  
  d.   focal point  
  8.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   20  
  c.   10  
  d.   1/2  
  9.Unlike mirrors, lenses have __________.  
  a.   many focal points  
  b.   one focal point  
  c.   two focal points  
  d.   no focal points  
  10.An image of a flower is seen through a lens. What is the object?  
  a.   a lens  
  b.   a flower  
  c.   a mirror  
  d.   an image  

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