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Chapter 18: Mirrors and Lenses

Practice Test
  1.A concave lens is also known as a __________ lens.  
  a.   diverging  
  b.   concave  
  c.   converging  
  d.   plane  
  2.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   critical  
  c.   real  
  d.   convex  
  3.The image produced by the ocular of a microscope is a(n) __________.  
  a.   virtual image  
  b.   real image  
  c.   reflected image  
  d.   object image  
  4.__________ is located behind a convex mirror.  
  a.   A ray  
  b.   The object  
  c.   The focal point  
  d.   A real image  
  5.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they collect more light  
  c.   they refract light less  
  d.   they reduce spherical aberration  
  6.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   behind the mirror  
  b.   between you and the mirror  
  c.   in front of the mirror  
  d.   behind you  
  7.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   focal point  
  b.   lens edge  
  c.   object  
  d.   image  
  8.The distance from the focal point to the mirror is the __________.  
  a.   focal distance  
  b.   focal length  
  c.   foci  
  d.   focus point  
  9.__________ single lenses have chromatic aberration  
  a.   Only parabolic  
  b.   Only concave  
  c.   Only convex  
  d.   All  
  10.The focal length of a concave lens is __________.  
  a.   positive  
  b.   negative  
  c.   reduced  
  d.   magnified  

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