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Mirrors and Lenses

Practice Test
      
  1.What kind of lens is helpful to nearsighted people?  
  a.   concave  
  b.   plane  
  c.   flat  
  d.   convex  
  Hint    
      
  2.What type of image does a microscope form?  
  a.   virtual diminished  
  b.   real enlarged  
  c.   real diminished  
  d.   virtual enlarged  
  Hint    
      
  3.What type of image is formed on the retina?  
  a.   inverted  
  b.   backwards  
  c.   upright virtual  
  d.   upright real  
  Hint    
      
  4.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   optic nerve  
  b.   focal point  
  c.   sclera  
  d.   cornea  
  Hint    
      
  5.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    
      
  6.A _________ mirror is a flat, smooth mirror.  
  a.   spherical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  7.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical length  
  b.   optical axis  
  c.   focal length  
  d.   focal point  
  Hint    
      
  8.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   spherical  
  Hint    
      
  9.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   focal point  
  b.   ray  
  c.   optical axis  
  d.   tangent  
  Hint    
      
  10.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   sclera  
  b.   optic nerve  
  c.   cornea  
  d.   retina  
  Hint    
      
  11.What is the difference between a lens and a mirror?  
  a.   Mirrors reflect light, and light passes through lenses.  
  b.   A mirror has no optical axis.  
  c.   Lenses reflect light, and light passes through mirrors.  
  d.   A lens has no focal point.  
  Hint    
      
  12.A _________ mirror is curved inward.  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   conical  
  Hint    
      
  13.The transparent covering on the human eyeball is called the __________.  
  a.   iris  
  b.   cornea  
  c.   lens  
  d.   retina  
  Hint    
      
  14.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  15.The law of reflection states that __________.  
  a.   the angle of incidence is equal to the angle of reflection  
  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.   light waves change their speed when they move from one medium into another  
  Hint    
      
  16.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    
      
  17.Which of these describes a real image?  
  a.   Rays diverge as they are reflected from the mirror.  
  b.   The image is formed by a plane mirror.  
  c.   No light rays pass through the image.  
  d.   Rays of light meet at the image.  
  Hint    
      
  18.Which of the following mirror shapes forms a real image?  
  a.   convex  
  b.   concave  
  c.   spherical  
  d.   plane  
  Hint    
      
  19.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    
      
  20.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   nearsightedness  
  b.   blindness  
  c.   a stigmatism  
  d.   farsightedness  
  Hint    

 
   
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