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Mirrors and Lenses

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

 
   
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