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Chapter 18: Mirrors and Lenses

Practice Test
  1.Real images produced by mirrors have __________ magnification.  
  a.   positive  
  b.   massive  
  c.   negative  
  d.   opposite  
  2.The image from a convex mirror will _________.  
  a.   always be projected  
  b.   always be real  
  c.   always be virtual  
  d.   never be virtual  
  3.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   1/2  
  c.   2  
  d.   10  
  4.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   convex mirror  
  c.   plane mirror  
  d.   parabolic mirror  
  5.A concave lens is also known as a __________ lens.  
  a.   diverging  
  b.   concave  
  c.   converging  
  d.   plane  
  6.__________ single lenses have chromatic aberration  
  a.   Only convex  
  b.   Only parabolic  
  c.   All  
  d.   Only concave  
  7.What does the F on a ray diagram represent?  
  a.   the location of the virtual image  
  b.   the center of the mirror  
  c.   the location of the object  
  d.   the focal point  
  8.A __________ image is formed when light rays converge and pass through the image.  
  a.   convex  
  b.   virtual  
  c.   real  
  d.   critical  
  9.Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?  
  a.   convex  
  b.   plane  
  c.   diffuse  
  d.   concave  
  10.An achromatic lens corrects chromatic aberration using __________.  
  a.   two convex lenses with the same index of refraction  
  b.   no lenses  
  c.   two concave lenses with the same index of refraction  
  d.   a combination of concave and convex lenses with different indices of refraction  

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