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Chapter 18: Mirrors and Lenses

Practice Test
  1.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   convex  
  b.   concave  
  c.   diffuse  
  d.   plane  
  2.A __________ image is formed when light rays converge and pass through the image.  
  a.   convex  
  b.   virtual  
  c.   critical  
  d.   real  
  3.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   1/2  
  c.   10  
  d.   2  
  4.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the focal point  
  c.   the center of the mirror  
  d.   the location of the object  
  5.An achromatic lens corrects chromatic aberration using __________.  
  a.   a combination of concave and convex lenses with different indices of refraction  
  b.   two concave lenses with the same index of refraction  
  c.   two convex lenses with the same index of refraction  
  d.   no lenses  
  6.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   lens edge  
  b.   object  
  c.   image  
  d.   focal point  
  7.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   many focal points  
  c.   no focal points  
  d.   one focal point  
  8.The focal length of a concave lens is __________.  
  a.   magnified  
  b.   reduced  
  c.   positive  
  d.   negative  
  9.The refractive indices of lenses are __________.  
  a.   independent of the refractive index of air  
  b.   greater than air  
  c.   less than air  
  d.   the same as air  
  10.Why are bigger lenses better for observing dim objects?  
  a.   they reduce spherical aberration  
  b.   they collect more light  
  c.   they refract light less  
  d.   they have better curvatures  

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