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Mirrors and Lenses

Practice Test
  1.Which of the following is required for your eye to see an object?  
  a.   light coming from the object  
  b.   a telescope  
  c.   a mirror  
  d.   air  
  2.The transparent covering on the human eyeball is called the __________.  
  a.   retina  
  b.   lens  
  c.   cornea  
  d.   iris  
  3.What is the difference between a lens and a mirror?  
  a.   A mirror has no optical axis.  
  b.   A lens has no focal point.  
  c.   Lenses reflect light, and light passes through mirrors.  
  d.   Mirrors reflect light, and light passes through lenses.  
  4.A _________ mirror is a flat, smooth mirror.  
  a.   convex  
  b.   spherical  
  c.   plane  
  d.   concave  
  5.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   plane  
  b.   convex  
  c.   concave  
  d.   spherical  
  6.A _________ mirror is curved inward.  
  a.   plane  
  b.   concave  
  c.   conical  
  d.   convex  
  7.Which of the following does your brain perceive even though no light rays pass through it?  
  a.   lens  
  b.   real image  
  c.   mirror  
  d.   virtual image  
  8.The __________ is the inner lining of your eye that has cells for converting light into electrical signals.  
  a.   sclera  
  b.   optic nerve  
  c.   cornea  
  d.   retina  
  9.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   farsightedness  
  b.   a stigmatism  
  c.   blindness  
  d.   nearsightedness  
  10.The law of reflection states that __________.  
  a.   the angle of incidence is greater that the angle of reflection  
  b.   the angle of incidence is less than the angle of reflection  
  c.   light waves change their speed when they move from one medium into another  
  d.   the angle of incidence is equal to the angle of reflection  
  11.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.   upright and enlarged  
  c.   inverted and smaller than the object  
  d.   enlarged and inverted  
  12.Which of the following uses a concave mirror?  
  a.   reflecting telescope  
  b.   space telescope  
  c.   refracting telescope  
  d.   telephoto lens  
  13.Which of the following concave lenses forms a virtual image?  
  a.   object beyond three focal lengths  
  b.   object between one and two focal lengths  
  c.   object between two and three focal lengths  
  d.   object within one focal length  
  14.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   cornea  
  b.   focal point  
  c.   optic nerve  
  d.   sclera  
  15.What type of image does a microscope form?  
  a.   real diminished  
  b.   virtual diminished  
  c.   real enlarged  
  d.   virtual enlarged  
  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  
  17.Any smooth surface that reflects light to form an image is a(n) __________.  
  a.   optical axis  
  b.   mirror  
  c.   lens  
  d.   camera  
  18.What type of image is formed on the retina?  
  a.   backwards  
  b.   inverted  
  c.   upright real  
  d.   upright virtual  
  19.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   focal point  
  b.   ray  
  c.   tangent  
  d.   optical axis  
  20.Which of these describes a real image?  
  a.   Rays diverge as they are reflected from the mirror.  
  b.   The image is formed by a plane mirror.  
  c.   Rays of light meet at the image.  
  d.   No light rays pass through the image.  

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