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Mirrors and Lenses

Practice Test
      
  1.What happens to light rays emitted from a light source?  
  a.   They follow the paths of Earth's magnetic field lines.  
  b.   They travel in curved paths.  
  c.   They remain concentrated at the light source.  
  d.   They spread out from the light source.  
  Hint    
      
  2.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   spherical  
  Hint    
      
  3.When an object is farther from a concave mirror than the focal point is, the image that is formed is __________.  
  a.   upright and smaller than the object  
  b.   inverted and smaller than the object  
  c.   enlarged and inverted  
  d.   upright and enlarged  
  Hint    
      
  4.Which of the following is required for your eye to see an object?  
  a.   a telescope  
  b.   a mirror  
  c.   air  
  d.   light coming from the object  
  Hint    
      
  5.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   camera  
  b.   optical axis  
  c.   mirror  
  d.   lens  
  Hint    
      
  6.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   a stigmatism  
  b.   nearsightedness  
  c.   farsightedness  
  d.   blindness  
  Hint    
      
  7.What type of image does a microscope form?  
  a.   real enlarged  
  b.   real diminished  
  c.   virtual enlarged  
  d.   virtual diminished  
  Hint    
      
  8.Which of the following uses a concave mirror?  
  a.   space telescope  
  b.   refracting telescope  
  c.   telephoto lens  
  d.   reflecting telescope  
  Hint    
      
  9.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    
      
  10.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    
      
  11.Which of these describes a real image?  
  a.   Rays diverge as they are reflected from the mirror.  
  b.   Rays of light meet at the image.  
  c.   No light rays pass through the image.  
  d.   The image is formed by a plane mirror.  
  Hint    
      
  12.The law of reflection states that __________.  
  a.   the angle of incidence is less than the angle of reflection  
  b.   the angle of incidence is equal to the angle of reflection  
  c.   the angle of incidence is greater that the angle of reflection  
  d.   light waves change their speed when they move from one medium into another  
  Hint    
      
  13.A _________ mirror is a flat, smooth mirror.  
  a.   convex  
  b.   plane  
  c.   concave  
  d.   spherical  
  Hint    
      
  14.What type of image is formed on the retina?  
  a.   backwards  
  b.   inverted  
  c.   upright virtual  
  d.   upright real  
  Hint    
      
  15.Which of the following mirror shapes forms a real image?  
  a.   concave  
  b.   plane  
  c.   spherical  
  d.   convex  
  Hint    
      
  16.A _________ mirror is curved outward.  
  a.   spherical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  17.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   concave  
  c.   flat  
  d.   plane  
  Hint    
      
  18.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    
      
  19.The transparent covering on the human eyeball is called the __________.  
  a.   lens  
  b.   iris  
  c.   retina  
  d.   cornea  
  Hint    
      
  20.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   optic nerve  
  b.   sclera  
  c.   cornea  
  d.   focal point  
  Hint    

 
   
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