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Mirrors and Lenses

Practice Test
      
  1.A _________ mirror is a flat, smooth mirror.  
  a.   spherical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  2.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   nearsightedness  
  b.   a stigmatism  
  c.   blindness  
  d.   farsightedness  
  Hint    
      
  3.The transparent covering on the human eyeball is called the __________.  
  a.   lens  
  b.   retina  
  c.   iris  
  d.   cornea  
  Hint    
      
  4.Which of the following mirror shapes forms a real image?  
  a.   plane  
  b.   spherical  
  c.   convex  
  d.   concave  
  Hint    
      
  5.A _________ mirror is curved inward.  
  a.   conical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  6.What type of image is formed on the retina?  
  a.   upright virtual  
  b.   inverted  
  c.   upright real  
  d.   backwards  
  Hint    
      
  7.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    
      
  8.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   convex  
  c.   plane  
  d.   concave  
  Hint    
      
  9.Which of the following is required for your eye to see an object?  
  a.   light coming from the object  
  b.   a telescope  
  c.   a mirror  
  d.   air  
  Hint    
      
  10.What happens to light rays emitted from a light source?  
  a.   They remain concentrated at the light source.  
  b.   They spread out from the light source.  
  c.   They follow the paths of Earth's magnetic field lines.  
  d.   They travel in curved paths.  
  Hint    
      
  11.When an object is farther from a concave mirror than the focal point is, the image that is formed is __________.  
  a.   enlarged and inverted  
  b.   inverted and smaller than the object  
  c.   upright and enlarged  
  d.   upright and smaller than the object  
  Hint    
      
  12.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    
      
  13.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   tangent  
  c.   focal point  
  d.   ray  
  Hint    
      
  14.A _________ mirror is curved outward.  
  a.   convex  
  b.   spherical  
  c.   concave  
  d.   plane  
  Hint    
      
  15.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   optic nerve  
  b.   retina  
  c.   cornea  
  d.   sclera  
  Hint    
      
  16.The law of reflection states that __________.  
  a.   the angle of incidence is greater that the angle of reflection  
  b.   the angle of incidence is less than the angle of reflection  
  c.   light waves change their speed when they move from one medium into another  
  d.   the angle of incidence is equal to the angle of reflection  
  Hint    
      
  17.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   optical axis  
  b.   camera  
  c.   mirror  
  d.   lens  
  Hint    
      
  18.Which of the following concave lenses forms a virtual image?  
  a.   object beyond three focal lengths  
  b.   object between two and three focal lengths  
  c.   object within one focal length  
  d.   object between one and two focal lengths  
  Hint    
      
  19.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    
      
  20.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical length  
  b.   focal point  
  c.   focal length  
  d.   optical axis  
  Hint    

 
   
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