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Mirrors and Lenses

Practice Test
      
  1.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   focal point  
  b.   cornea  
  c.   optic nerve  
  d.   sclera  
  Hint    
      
  2.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   plane  
  c.   convex  
  d.   concave  
  Hint    
      
  3.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.   light waves change their speed when they move from one medium into another  
  d.   the angle of incidence is less than the angle of reflection  
  Hint    
      
  4.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   retina  
  c.   lens  
  d.   iris  
  Hint    
      
  5.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   concave  
  b.   convex  
  c.   spherical  
  d.   plane  
  Hint    
      
  6.What type of image is formed on the retina?  
  a.   backwards  
  b.   upright real  
  c.   inverted  
  d.   upright virtual  
  Hint    
      
  7.A _________ mirror is curved outward.  
  a.   convex  
  b.   spherical  
  c.   plane  
  d.   concave  
  Hint    
      
  8.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   optical axis  
  b.   mirror  
  c.   lens  
  d.   camera  
  Hint    
      
  9.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   farsightedness  
  b.   a stigmatism  
  c.   nearsightedness  
  d.   blindness  
  Hint    
      
  10.Which of the following mirror shapes forms a real image?  
  a.   spherical  
  b.   concave  
  c.   plane  
  d.   convex  
  Hint    
      
  11.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   ray  
  c.   focal point  
  d.   tangent  
  Hint    
      
  12.What is the difference between a lens and a mirror?  
  a.   Lenses reflect light, and light passes through mirrors.  
  b.   A lens has no focal point.  
  c.   Mirrors reflect light, and light passes through lenses.  
  d.   A mirror has no optical axis.  
  Hint    
      
  13.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   virtual image  
  b.   real image  
  c.   lens  
  d.   mirror  
  Hint    
      
  14.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.   enlarged and inverted  
  c.   inverted and smaller than the object  
  d.   upright and enlarged  
  Hint    
      
  15.Which of the following concave lenses forms a virtual image?  
  a.   object between two and three focal lengths  
  b.   object beyond three focal lengths  
  c.   object within one focal length  
  d.   object between one and two focal lengths  
  Hint    
      
  16.Which of the following is required for your eye to see an object?  
  a.   a mirror  
  b.   air  
  c.   a telescope  
  d.   light coming from the object  
  Hint    
      
  17.A _________ mirror is a flat, smooth mirror.  
  a.   convex  
  b.   plane  
  c.   spherical  
  d.   concave  
  Hint    
      
  18.A _________ mirror is curved inward.  
  a.   conical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  19.What type of image does a microscope form?  
  a.   virtual diminished  
  b.   real enlarged  
  c.   real diminished  
  d.   virtual enlarged  
  Hint    
      
  20.What happens to light rays emitted from a light source?  
  a.   They spread out from the light source.  
  b.   They remain concentrated at the light source.  
  c.   They travel in curved paths.  
  d.   They follow the paths of Earth's magnetic field lines.  
  Hint    

 
   
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