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Mirrors and Lenses

Practice Test
      
  1.Which of the following is required for your eye to see an object?  
  a.   a mirror  
  b.   a telescope  
  c.   air  
  d.   light coming from the object  
  Hint    
      
  2.Which of these describes a real image?  
  a.   No light rays pass through the image.  
  b.   Rays of light meet at the image.  
  c.   The image is formed by a plane mirror.  
  d.   Rays diverge as they are reflected from the mirror.  
  Hint    
      
  3.The transparent covering on the human eyeball is called the __________.  
  a.   retina  
  b.   cornea  
  c.   iris  
  d.   lens  
  Hint    
      
  4.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    
      
  5.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   lens  
  b.   real image  
  c.   virtual image  
  d.   mirror  
  Hint    
      
  6.A _________ mirror is curved outward.  
  a.   convex  
  b.   plane  
  c.   spherical  
  d.   concave  
  Hint    
      
  7.Which of the following uses a concave mirror?  
  a.   space telescope  
  b.   telephoto lens  
  c.   reflecting telescope  
  d.   refracting telescope  
  Hint    
      
  8.A _________ mirror is a flat, smooth mirror.  
  a.   concave  
  b.   plane  
  c.   convex  
  d.   spherical  
  Hint    
      
  9.A _________ mirror is curved inward.  
  a.   concave  
  b.   conical  
  c.   convex  
  d.   plane  
  Hint    
      
  10.What type of image is formed on the retina?  
  a.   inverted  
  b.   backwards  
  c.   upright real  
  d.   upright virtual  
  Hint    
      
  11.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    
      
  12.Which of the following mirror shapes forms a real image?  
  a.   spherical  
  b.   convex  
  c.   concave  
  d.   plane  
  Hint    
      
  13.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   a stigmatism  
  b.   farsightedness  
  c.   blindness  
  d.   nearsightedness  
  Hint    
      
  14.A __________ lens is thicker in the middle than at the edges.  
  a.   concave  
  b.   spherical  
  c.   convex  
  d.   plane  
  Hint    
      
  15.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   focal point  
  b.   optical axis  
  c.   tangent  
  d.   ray  
  Hint    
      
  16.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   flat  
  c.   concave  
  d.   plane  
  Hint    
      
  17.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   spherical  
  Hint    
      
  18.What type of image does a microscope form?  
  a.   real enlarged  
  b.   virtual diminished  
  c.   real diminished  
  d.   virtual enlarged  
  Hint    
      
  19.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    
      
  20.What happens to light rays emitted from a light source?  
  a.   They travel in curved paths.  
  b.   They remain concentrated at the light source.  
  c.   They follow the paths of Earth's magnetic field lines.  
  d.   They spread out from the light source.  
  Hint    

 
   
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