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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.   Lenses reflect light, and light passes through mirrors.  
  c.   Mirrors reflect light, and light passes through lenses.  
  d.   A lens has no focal point.  
  Hint    
      
  2.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   real image  
  b.   virtual image  
  c.   lens  
  d.   mirror  
  Hint    
      
  3.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   focal point  
  c.   ray  
  d.   tangent  
  Hint    
      
  4.What type of image does a microscope form?  
  a.   real enlarged  
  b.   virtual diminished  
  c.   virtual enlarged  
  d.   real diminished  
  Hint    
      
  5.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    
      
  6.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   cornea  
  b.   focal point  
  c.   sclera  
  d.   optic nerve  
  Hint    
      
  7.Which of the following mirror shapes forms a real image?  
  a.   spherical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  8.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   camera  
  b.   mirror  
  c.   optical axis  
  d.   lens  
  Hint    
      
  9.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   concave  
  b.   spherical  
  c.   plane  
  d.   convex  
  Hint    
      
  10.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   a stigmatism  
  b.   nearsightedness  
  c.   blindness  
  d.   farsightedness  
  Hint    
      
  11.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   flat  
  Hint    
      
  12.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    
      
  13.Which of the following is required for your eye to see an object?  
  a.   light coming from the object  
  b.   a mirror  
  c.   a telescope  
  d.   air  
  Hint    
      
  14.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   iris  
  c.   lens  
  d.   retina  
  Hint    
      
  15.A _________ mirror is curved inward.  
  a.   convex  
  b.   conical  
  c.   concave  
  d.   plane  
  Hint    
      
  16.Which of the following uses a concave mirror?  
  a.   refracting telescope  
  b.   space telescope  
  c.   reflecting telescope  
  d.   telephoto lens  
  Hint    
      
  17.A __________ lens is thicker in the middle than at the edges.  
  a.   concave  
  b.   convex  
  c.   spherical  
  d.   plane  
  Hint    
      
  18.What type of image is formed on the retina?  
  a.   inverted  
  b.   upright virtual  
  c.   backwards  
  d.   upright real  
  Hint    
      
  19.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   sclera  
  b.   cornea  
  c.   optic nerve  
  d.   retina  
  Hint    
      
  20.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 two and three focal lengths  
  d.   object between one and two focal lengths  
  Hint    

 
   
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