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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.   behind you  
  b.   in front of the mirror  
  c.   behind the mirror  
  d.   between you and the mirror  
  2.__________ is located behind a convex mirror.  
  a.   A real image  
  b.   A ray  
  c.   The object  
  d.   The focal point  
  3.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.   concave  
  d.   diffuse  
  4.Why are bigger lenses better for observing dim objects?  
  a.   they reduce spherical aberration  
  b.   they have better curvatures  
  c.   they refract light less  
  d.   they collect more light  
  5.A __________ image is formed when light rays converge and pass through the image.  
  a.   virtual  
  b.   convex  
  c.   real  
  d.   critical  
  6.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.   1.3 m  
  b.   4.0 m  
  c.   2.0 m  
  d.   0.67 m  
  7.An achromatic lens corrects chromatic aberration using __________.  
  a.   two concave lenses with the same index of refraction  
  b.   no lenses  
  c.   two convex lenses with the same index of refraction  
  d.   a combination of concave and convex lenses with different indices of refraction  
  8.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  
  9.Real images produced by mirrors have __________ magnification.  
  a.   negative  
  b.   massive  
  c.   positive  
  d.   opposite  
  10.Spherical aberration can be avoided by using a __________.  
  a.   spherical mirror  
  b.   parabolic mirror  
  c.   plane mirror  
  d.   convex mirror  

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