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Chapter 18: Mirrors and Lenses

Practice Test
  1.In a ray tracing diagram, two rays must pass through the __________ to determine the location of the image.  
  a.   object  
  b.   focal point  
  c.   lens edge  
  d.   image  
  2.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   a lens  
  c.   an image  
  d.   a flower  
  3.The image produced by the ocular of a microscope is a(n) __________.  
  a.   reflected image  
  b.   object image  
  c.   real image  
  d.   virtual image  
  4.In a concave mirror, an object placed __________ will result in a virtual image.  
  a.   between the focal point and mirror  
  b.   between the focal point and twice the distance of the focal point  
  c.   past the focal point  
  d.   twice the distance of the focal point  
  5.In nearsightedness, the image is focused __________.  
  a.   directly on the retina  
  b.   beyond the retina  
  c.   in front of the eye  
  d.   in front of the retina  
  6.__________ single lenses have chromatic aberration  
  a.   Only concave  
  b.   Only parabolic  
  c.   Only convex  
  d.   All  
  7.You are standing in front of a bathroom mirror. Where is your image located?  
  a.   between you and the mirror  
  b.   behind the mirror  
  c.   behind you  
  d.   in front of the mirror  
  8.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   20  
  c.   1/2  
  d.   10  
  9.Why are bigger lenses better for observing dim objects?  
  a.   they have better curvatures  
  b.   they refract light less  
  c.   they reduce spherical aberration  
  d.   they collect more light  
  10.What does the F on a ray diagram represent?  
  a.   the location of the object  
  b.   the location of the virtual image  
  c.   the focal point  
  d.   the center of the mirror  

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