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Mirrors and Lenses

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

 
   
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