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Chapter 18: Mirrors and Lenses

Practice Test
  1.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   in front of the mirror  
  b.   behind the mirror  
  c.   between you and the mirror  
  d.   behind you  
  2.In nearsightedness, the image is focused __________.  
  a.   in front of the eye  
  b.   beyond the retina  
  c.   directly on the retina  
  d.   in front of the retina  
  3.A __________ image is formed when light rays converge and pass through the image.  
  a.   real  
  b.   convex  
  c.   critical  
  d.   virtual  
  4.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.   2.0 m  
  c.   1.3 m  
  d.   4.0 m  
  5.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   object image  
  c.   virtual image  
  d.   reflected image  
  6.The refractive indices of lenses are __________.  
  a.   the same as air  
  b.   less than air  
  c.   greater than air  
  d.   independent of the refractive index of air  
  7.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   2  
  c.   1/2  
  d.   10  
  8.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   many focal points  
  c.   no focal points  
  d.   two focal points  
  9.A concave lens is also known as a __________ lens.  
  a.   plane  
  b.   concave  
  c.   converging  
  d.   diverging  
  10.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  

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