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Mirrors and Lenses

Practice Test
      
  1.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   spherical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  2.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    
      
  3.The law of reflection states that __________.  
  a.   light waves change their speed when they move from one medium into another  
  b.   the angle of incidence is greater that the angle of reflection  
  c.   the angle of incidence is less than the angle of reflection  
  d.   the angle of incidence is equal to the angle of reflection  
  Hint    
      
  4.Which of the following uses a concave mirror?  
  a.   space telescope  
  b.   telephoto lens  
  c.   refracting telescope  
  d.   reflecting telescope  
  Hint    
      
  5.What type of image is formed on the retina?  
  a.   upright virtual  
  b.   inverted  
  c.   backwards  
  d.   upright real  
  Hint    
      
  6.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   focal point  
  c.   tangent  
  d.   ray  
  Hint    
      
  7.A _________ mirror is a flat, smooth mirror.  
  a.   spherical  
  b.   concave  
  c.   plane  
  d.   convex  
  Hint    
      
  8.What kind of lens is helpful to nearsighted people?  
  a.   flat  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  9.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   virtual image  
  b.   mirror  
  c.   lens  
  d.   real image  
  Hint    
      
  10.Which of the following concave lenses forms a virtual image?  
  a.   object beyond three focal lengths  
  b.   object between one and two focal lengths  
  c.   object within one focal length  
  d.   object between two and three focal lengths  
  Hint    
      
  11.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   camera  
  b.   mirror  
  c.   optical axis  
  d.   lens  
  Hint    
      
  12.Which of these describes a real image?  
  a.   No light rays pass through the image.  
  b.   Rays diverge as they are reflected from the mirror.  
  c.   The image is formed by a plane mirror.  
  d.   Rays of light meet at the image.  
  Hint    
      
  13.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   blindness  
  b.   farsightedness  
  c.   a stigmatism  
  d.   nearsightedness  
  Hint    
      
  14.A __________ lens is thicker in the middle than at the edges.  
  a.   convex  
  b.   plane  
  c.   concave  
  d.   spherical  
  Hint    
      
  15.A _________ mirror is curved outward.  
  a.   plane  
  b.   spherical  
  c.   convex  
  d.   concave  
  Hint    
      
  16.Which of the following mirror shapes forms a real image?  
  a.   plane  
  b.   spherical  
  c.   concave  
  d.   convex  
  Hint    
      
  17.The transparent covering on the human eyeball is called the __________.  
  a.   iris  
  b.   lens  
  c.   retina  
  d.   cornea  
  Hint    
      
  18.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    
      
  19.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    
      
  20.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical length  
  b.   focal length  
  c.   optical axis  
  d.   focal point  
  Hint    

 
   
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