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Mirrors and Lenses

Practice Test
      
  1.Which of the following concave lenses forms a virtual image?  
  a.   object within one focal length  
  b.   object between two and three focal lengths  
  c.   object between one and two focal lengths  
  d.   object beyond three focal lengths  
  Hint    
      
  2.What type of image is formed on the retina?  
  a.   backwards  
  b.   inverted  
  c.   upright real  
  d.   upright virtual  
  Hint    
      
  3.The transparent covering on the human eyeball is called the __________.  
  a.   retina  
  b.   iris  
  c.   cornea  
  d.   lens  
  Hint    
      
  4.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   mirror  
  b.   lens  
  c.   optical axis  
  d.   camera  
  Hint    
      
  5.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   real image  
  b.   virtual image  
  c.   lens  
  d.   mirror  
  Hint    
      
  6.Which of the following mirror shapes forms a real image?  
  a.   concave  
  b.   spherical  
  c.   convex  
  d.   plane  
  Hint    
      
  7.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   concave  
  b.   plane  
  c.   spherical  
  d.   convex  
  Hint    
      
  8.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   plane  
  c.   concave  
  d.   convex  
  Hint    
      
  9.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   blindness  
  b.   a stigmatism  
  c.   nearsightedness  
  d.   farsightedness  
  Hint    
      
  10.What type of image does a microscope form?  
  a.   real enlarged  
  b.   real diminished  
  c.   virtual enlarged  
  d.   virtual diminished  
  Hint    
      
  11.A _________ mirror is curved outward.  
  a.   spherical  
  b.   plane  
  c.   concave  
  d.   convex  
  Hint    
      
  12.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   tangent  
  b.   ray  
  c.   focal point  
  d.   optical axis  
  Hint    
      
  13.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   flat  
  c.   plane  
  d.   concave  
  Hint    
      
  14.Which of the following is required for your eye to see an object?  
  a.   light coming from the object  
  b.   air  
  c.   a mirror  
  d.   a telescope  
  Hint    
      
  15.Which of these describes a real image?  
  a.   Rays of light meet at the image.  
  b.   The image is formed by a plane mirror.  
  c.   No light rays pass through the image.  
  d.   Rays diverge as they are reflected from the mirror.  
  Hint    
      
  16.What is the difference between a lens and a mirror?  
  a.   A mirror has no optical axis.  
  b.   Lenses reflect light, and light passes through mirrors.  
  c.   A lens has no focal point.  
  d.   Mirrors reflect light, and light passes through lenses.  
  Hint    
      
  17.The distance from the center of the mirror to the focal point is called the _________.  
  a.   focal point  
  b.   optical length  
  c.   optical axis  
  d.   focal length  
  Hint    
      
  18.A _________ mirror is curved inward.  
  a.   plane  
  b.   convex  
  c.   concave  
  d.   conical  
  Hint    
      
  19.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   optic nerve  
  b.   sclera  
  c.   retina  
  d.   cornea  
  Hint    
      
  20.When an object is farther from a concave mirror than the focal point is, the image that is formed is __________.  
  a.   enlarged and inverted  
  b.   upright and smaller than the object  
  c.   inverted and smaller than the object  
  d.   upright and enlarged  
  Hint    

 
   
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