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Mirrors and Lenses

Practice Test
      
  1.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   optic nerve  
  b.   cornea  
  c.   sclera  
  d.   retina  
  Hint    
      
  2.What type of image does a microscope form?  
  a.   real diminished  
  b.   virtual enlarged  
  c.   virtual diminished  
  d.   real enlarged  
  Hint    
      
  3.Which of the following uses a concave mirror?  
  a.   space telescope  
  b.   telephoto lens  
  c.   reflecting telescope  
  d.   refracting telescope  
  Hint    
      
  4.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   concave  
  c.   flat  
  d.   plane  
  Hint    
      
  5.Which of the following is required for your eye to see an object?  
  a.   air  
  b.   a telescope  
  c.   light coming from the object  
  d.   a mirror  
  Hint    
      
  6.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   cornea  
  b.   sclera  
  c.   optic nerve  
  d.   focal point  
  Hint    
      
  7.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   tangent  
  c.   ray  
  d.   focal point  
  Hint    
      
  8.A _________ mirror is a flat, smooth mirror.  
  a.   plane  
  b.   concave  
  c.   convex  
  d.   spherical  
  Hint    
      
  9.Which of these describes a real image?  
  a.   Rays of light meet at the image.  
  b.   The image is formed by a plane mirror.  
  c.   No light rays pass through the image.  
  d.   Rays diverge as they are reflected from the mirror.  
  Hint    
      
  10.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   plane  
  c.   concave  
  d.   convex  
  Hint    
      
  11.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   mirror  
  b.   camera  
  c.   optical axis  
  d.   lens  
  Hint    
      
  12.Which of the following mirror shapes forms a real image?  
  a.   concave  
  b.   convex  
  c.   spherical  
  d.   plane  
  Hint    
      
  13.Which of the following concave lenses forms a virtual image?  
  a.   object between one and two focal lengths  
  b.   object between two and three focal lengths  
  c.   object within one focal length  
  d.   object beyond three focal lengths  
  Hint    
      
  14.The law of reflection states that __________.  
  a.   the angle of incidence is equal to the angle of reflection  
  b.   the angle of incidence is less than 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    
      
  15.What type of image is formed on the retina?  
  a.   inverted  
  b.   upright virtual  
  c.   backwards  
  d.   upright real  
  Hint    
      
  16.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 smaller than the object  
  d.   upright and enlarged  
  Hint    
      
  17.The distance from the center of the mirror to the focal point is called the _________.  
  a.   optical length  
  b.   optical axis  
  c.   focal length  
  d.   focal point  
  Hint    
      
  18.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   lens  
  b.   virtual image  
  c.   mirror  
  d.   real image  
  Hint    
      
  19.The transparent covering on the human eyeball is called the __________.  
  a.   lens  
  b.   cornea  
  c.   iris  
  d.   retina  
  Hint    
      
  20.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 travel in curved paths.  
  d.   They follow the paths of Earth's magnetic field lines.  
  Hint    

 
   
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