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Mirrors and Lenses

Practice Test
      
  1.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   concave  
  c.   convex  
  d.   plane  
  Hint    
      
  2.A _________ mirror is curved inward.  
  a.   plane  
  b.   convex  
  c.   concave  
  d.   conical  
  Hint    
      
  3.The law of reflection states that __________.  
  a.   the angle of incidence is less than the angle of reflection  
  b.   light waves change their speed when they move from one medium into another  
  c.   the angle of incidence is equal to the angle of reflection  
  d.   the angle of incidence is greater that the angle of reflection  
  Hint    
      
  4.A _________ mirror is curved outward.  
  a.   convex  
  b.   plane  
  c.   concave  
  d.   spherical  
  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.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.   upright and smaller than the object  
  c.   upright and enlarged  
  d.   inverted and smaller than the object  
  Hint    
      
  7.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   mirror  
  b.   real image  
  c.   virtual image  
  d.   lens  
  Hint    
      
  8.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    
      
  9.Which of these describes a real image?  
  a.   The image is formed by a plane mirror.  
  b.   Rays diverge as they are reflected from the mirror.  
  c.   Rays of light meet at the image.  
  d.   No light rays pass through the image.  
  Hint    
      
  10.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   ray  
  b.   tangent  
  c.   optical axis  
  d.   focal point  
  Hint    
      
  11.The distance from the center of the mirror to the focal point is called the _________.  
  a.   focal point  
  b.   optical axis  
  c.   focal length  
  d.   optical length  
  Hint    
      
  12.What happens to light rays emitted from a light source?  
  a.   They follow the paths of Earth's magnetic field lines.  
  b.   They remain concentrated at the light source.  
  c.   They spread out from the light source.  
  d.   They travel in curved paths.  
  Hint    
      
  13.What is the difference between a lens and a mirror?  
  a.   Lenses reflect light, and light passes through mirrors.  
  b.   Mirrors reflect light, and light passes through lenses.  
  c.   A lens has no focal point.  
  d.   A mirror has no optical axis.  
  Hint    
      
  14.Which of the following uses a concave mirror?  
  a.   telephoto lens  
  b.   space telescope  
  c.   reflecting telescope  
  d.   refracting telescope  
  Hint    
      
  15.What type of image is formed on the retina?  
  a.   upright virtual  
  b.   upright real  
  c.   inverted  
  d.   backwards  
  Hint    
      
  16.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   optic nerve  
  b.   retina  
  c.   sclera  
  d.   cornea  
  Hint    
      
  17.Which of the following mirror shapes forms a real image?  
  a.   plane  
  b.   convex  
  c.   concave  
  d.   spherical  
  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.What kind of lens is helpful to nearsighted people?  
  a.   convex  
  b.   plane  
  c.   concave  
  d.   flat  
  Hint    
      
  20.The transparent covering on the human eyeball is called the __________.  
  a.   retina  
  b.   cornea  
  c.   iris  
  d.   lens  
  Hint    

 
   
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