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Mirrors and Lenses

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

 
   
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