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Mirrors and Lenses

Practice Test
      
  1.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   spherical  
  Hint    
      
  2.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   retina  
  b.   sclera  
  c.   cornea  
  d.   optic nerve  
  Hint    
      
  3.What happens to light rays emitted from a light source?  
  a.   They travel in curved paths.  
  b.   They follow the paths of Earth's magnetic field lines.  
  c.   They spread out from the light source.  
  d.   They remain concentrated at the light source.  
  Hint    
      
  4.Which of the following concave lenses forms a virtual image?  
  a.   object within one focal length  
  b.   object between one and two focal lengths  
  c.   object between two and three focal lengths  
  d.   object beyond three focal lengths  
  Hint    
      
  5.When an object is farther from a concave mirror than the focal point is, the image that is formed is __________.  
  a.   upright and enlarged  
  b.   upright and smaller than the object  
  c.   enlarged and inverted  
  d.   inverted and smaller than the object  
  Hint    
      
  6.A _________ mirror is a flat, smooth mirror.  
  a.   plane  
  b.   spherical  
  c.   concave  
  d.   convex  
  Hint    
      
  7.A __________ lens is thicker in the middle than at the edges.  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   spherical  
  Hint    
      
  8.A _________ mirror is curved inward.  
  a.   concave  
  b.   convex  
  c.   plane  
  d.   conical  
  Hint    
      
  9.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   farsightedness  
  b.   blindness  
  c.   nearsightedness  
  d.   a stigmatism  
  Hint    
      
  10.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   concave  
  c.   flat  
  d.   plane  
  Hint    
      
  11.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical length  
  b.   focal point  
  c.   optical axis  
  d.   focal length  
  Hint    
      
  12.What is the difference between a lens and a mirror?  
  a.   Mirrors reflect light, and light passes through lenses.  
  b.   Lenses reflect light, and light passes through mirrors.  
  c.   A lens has no focal point.  
  d.   A mirror has no optical axis.  
  Hint    
      
  13.What type of image is formed on the retina?  
  a.   upright virtual  
  b.   inverted  
  c.   backwards  
  d.   upright real  
  Hint    
      
  14.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   sclera  
  b.   optic nerve  
  c.   focal point  
  d.   cornea  
  Hint    
      
  15.Which of the following mirror shapes forms a real image?  
  a.   spherical  
  b.   concave  
  c.   plane  
  d.   convex  
  Hint    
      
  16.Which of the following uses a concave mirror?  
  a.   refracting telescope  
  b.   reflecting telescope  
  c.   space telescope  
  d.   telephoto lens  
  Hint    
      
  17.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   lens  
  c.   retina  
  d.   iris  
  Hint    
      
  18.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   real image  
  b.   lens  
  c.   virtual image  
  d.   mirror  
  Hint    
      
  19.A _________ mirror is curved outward.  
  a.   spherical  
  b.   convex  
  c.   concave  
  d.   plane  
  Hint    
      
  20.Which of the following is required for your eye to see an object?  
  a.   air  
  b.   light coming from the object  
  c.   a telescope  
  d.   a mirror  
  Hint    

 
   
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