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Mirrors and Lenses

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

 
   
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