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Mirrors and Lenses

Practice Test
      
  1.Which of the following mirror shapes forms a real image?  
  a.   convex  
  b.   spherical  
  c.   concave  
  d.   plane  
  Hint    
      
  2.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   focal point  
  b.   tangent  
  c.   optical axis  
  d.   ray  
  Hint    
      
  3.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   camera  
  b.   optical axis  
  c.   mirror  
  d.   lens  
  Hint    
      
  4.A _________ mirror is curved outward.  
  a.   convex  
  b.   concave  
  c.   plane  
  d.   spherical  
  Hint    
      
  5.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   concave  
  c.   flat  
  d.   plane  
  Hint    
      
  6.The distance from the center of the mirror to the focal point is called the _________.  
  a.   focal length  
  b.   focal point  
  c.   optical length  
  d.   optical axis  
  Hint    
      
  7.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.   enlarged and inverted  
  c.   upright and smaller than the object  
  d.   inverted and smaller than the object  
  Hint    
      
  8.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   cornea  
  b.   sclera  
  c.   optic nerve  
  d.   retina  
  Hint    
      
  9.What happens to light rays emitted from a light source?  
  a.   They remain concentrated at the light source.  
  b.   They follow the paths of Earth's magnetic field lines.  
  c.   They travel in curved paths.  
  d.   They spread out from the light source.  
  Hint    
      
  10.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    
      
  11.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   spherical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  12.Which of the following uses a concave mirror?  
  a.   reflecting telescope  
  b.   telephoto lens  
  c.   refracting telescope  
  d.   space telescope  
  Hint    
      
  13.Which of these describes a real image?  
  a.   No light rays pass through the image.  
  b.   Rays diverge as they are reflected from the mirror.  
  c.   The image is formed by a plane mirror.  
  d.   Rays of light meet at the image.  
  Hint    
      
  14.A __________ lens is thicker in the middle than at the edges.  
  a.   convex  
  b.   plane  
  c.   concave  
  d.   spherical  
  Hint    
      
  15.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   blindness  
  b.   nearsightedness  
  c.   farsightedness  
  d.   a stigmatism  
  Hint    
      
  16.A _________ mirror is a flat, smooth mirror.  
  a.   convex  
  b.   spherical  
  c.   plane  
  d.   concave  
  Hint    
      
  17.What type of image is formed on the retina?  
  a.   backwards  
  b.   upright real  
  c.   inverted  
  d.   upright virtual  
  Hint    
      
  18.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.   the angle of incidence is less than the angle of reflection  
  d.   light waves change their speed when they move from one medium into another  
  Hint    
      
  19.What type of image does a microscope form?  
  a.   virtual enlarged  
  b.   real diminished  
  c.   virtual diminished  
  d.   real enlarged  
  Hint    
      
  20.A _________ mirror is curved inward.  
  a.   plane  
  b.   convex  
  c.   conical  
  d.   concave  
  Hint    

 
   
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