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Mirrors and Lenses

Practice Test
      
  1.What is the difference between a lens and a mirror?  
  a.   A lens has no focal point.  
  b.   Lenses reflect light, and light passes through mirrors.  
  c.   A mirror has no optical axis.  
  d.   Mirrors reflect light, and light passes through lenses.  
  Hint    
      
  2.Which of the following concave lenses forms a virtual image?  
  a.   object within one focal length  
  b.   object between two and three focal lengths  
  c.   object between one and two focal lengths  
  d.   object beyond three focal lengths  
  Hint    
      
  3.The law of reflection states that __________.  
  a.   the angle of incidence is less than the angle of reflection  
  b.   the angle of incidence is greater that the angle of reflection  
  c.   light waves change their speed when they move from one medium into another  
  d.   the angle of incidence is equal to the angle of reflection  
  Hint    
      
  4.A __________ lens is thicker in the middle than at the edges.  
  a.   convex  
  b.   spherical  
  c.   plane  
  d.   concave  
  Hint    
      
  5.A _________ mirror is a flat, smooth mirror.  
  a.   concave  
  b.   plane  
  c.   convex  
  d.   spherical  
  Hint    
      
  6.What kind of lens is helpful to nearsighted people?  
  a.   flat  
  b.   convex  
  c.   concave  
  d.   plane  
  Hint    
      
  7.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   tangent  
  c.   focal point  
  d.   ray  
  Hint    
      
  8.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   sclera  
  b.   retina  
  c.   cornea  
  d.   optic nerve  
  Hint    
      
  9.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    
      
  10.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   cornea  
  b.   sclera  
  c.   optic nerve  
  d.   focal point  
  Hint    
      
  11.A _________ mirror is curved outward.  
  a.   plane  
  b.   concave  
  c.   spherical  
  d.   convex  
  Hint    
      
  12.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   spherical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  13.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   lens  
  c.   retina  
  d.   iris  
  Hint    
      
  14.Which of the following uses a concave mirror?  
  a.   refracting telescope  
  b.   space telescope  
  c.   telephoto lens  
  d.   reflecting telescope  
  Hint    
      
  15.Which of the following mirror shapes forms a real image?  
  a.   plane  
  b.   spherical  
  c.   concave  
  d.   convex  
  Hint    
      
  16.What type of image does a microscope form?  
  a.   virtual diminished  
  b.   real enlarged  
  c.   real diminished  
  d.   virtual enlarged  
  Hint    
      
  17.What type of image is formed on the retina?  
  a.   upright virtual  
  b.   inverted  
  c.   backwards  
  d.   upright real  
  Hint    
      
  18.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical axis  
  b.   focal point  
  c.   focal length  
  d.   optical length  
  Hint    
      
  19.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   mirror  
  b.   lens  
  c.   real image  
  d.   virtual image  
  Hint    
      
  20.When an object is farther from a concave mirror than the focal point is, the image that is formed is __________.  
  a.   inverted and smaller than the object  
  b.   upright and enlarged  
  c.   upright and smaller than the object  
  d.   enlarged and inverted  
  Hint    

 
   
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