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Mirrors and Lenses

Practice Test
      
  1.A _________ mirror is curved inward.  
  a.   concave  
  b.   convex  
  c.   conical  
  d.   plane  
  Hint    
      
  2.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   cornea  
  b.   focal point  
  c.   optic nerve  
  d.   sclera  
  Hint    
      
  3.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.   inverted and smaller than the object  
  c.   upright and enlarged  
  d.   upright and smaller than the object  
  Hint    
      
  4.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.   Rays of light meet at the image.  
  d.   No light rays pass through the image.  
  Hint    
      
  5.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   a stigmatism  
  b.   nearsightedness  
  c.   blindness  
  d.   farsightedness  
  Hint    
      
  6.Which of the following concave lenses forms a virtual image?  
  a.   object beyond three focal lengths  
  b.   object between two and three focal lengths  
  c.   object between one and two focal lengths  
  d.   object within one focal length  
  Hint    
      
  7.What type of image is formed on the retina?  
  a.   backwards  
  b.   inverted  
  c.   upright real  
  d.   upright virtual  
  Hint    
      
  8.Which of the following uses a concave mirror?  
  a.   reflecting telescope  
  b.   space telescope  
  c.   refracting telescope  
  d.   telephoto lens  
  Hint    
      
  9.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   iris  
  c.   retina  
  d.   lens  
  Hint    
      
  10.Which of the following mirror shapes forms a real image?  
  a.   plane  
  b.   convex  
  c.   concave  
  d.   spherical  
  Hint    
      
  11.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.   A mirror has no optical axis.  
  d.   Lenses reflect light, and light passes through mirrors.  
  Hint    
      
  12.Which of the following is required for your eye to see an object?  
  a.   air  
  b.   a telescope  
  c.   light coming from the object  
  d.   a mirror  
  Hint    
      
  13.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   cornea  
  b.   optic nerve  
  c.   retina  
  d.   sclera  
  Hint    
      
  14.What happens to light rays emitted from a light source?  
  a.   They travel in curved paths.  
  b.   They follow the paths of Earth's magnetic field lines.  
  c.   They spread out from the light source.  
  d.   They remain concentrated at the light source.  
  Hint    
      
  15.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   lens  
  b.   mirror  
  c.   camera  
  d.   optical axis  
  Hint    
      
  16.The law of reflection states that __________.  
  a.   the angle of incidence is greater that the angle of reflection  
  b.   the angle of incidence is equal to the angle of reflection  
  c.   the angle of incidence is less than the angle of reflection  
  d.   light waves change their speed when they move from one medium into another  
  Hint    
      
  17.A __________ lens is thicker in the middle than at the edges.  
  a.   concave  
  b.   spherical  
  c.   convex  
  d.   plane  
  Hint    
      
  18.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   lens  
  b.   real image  
  c.   virtual image  
  d.   mirror  
  Hint    
      
  19.A _________ mirror is curved outward.  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   spherical  
  Hint    
      
  20.The distance from the center of the mirror to the focal point is called the _________.  
  a.   focal point  
  b.   focal length  
  c.   optical length  
  d.   optical axis  
  Hint    

 
   
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