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Mirrors and Lenses

Practice Test
  1.The transparent covering on the human eyeball is called the __________.  
  a.   cornea  
  b.   iris  
  c.   retina  
  d.   lens  
  2.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  
  3.What is the difference between a lens and a mirror?  
  a.   A lens has no focal point.  
  b.   Lenses reflect light, and light passes through mirrors.  
  c.   Mirrors reflect light, and light passes through lenses.  
  d.   A mirror has no optical axis.  
  4.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  
  5.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  
  6.What type of image is formed on the retina?  
  a.   inverted  
  b.   backwards  
  c.   upright virtual  
  d.   upright real  
  7.What structure carries electrical signals from the retina to the brain to be interpreted?  
  a.   focal point  
  b.   cornea  
  c.   sclera  
  d.   optic nerve  
  8.Which of the following conditions occurs when the cornea is curved unevenly?  
  a.   farsightedness  
  b.   nearsightedness  
  c.   a stigmatism  
  d.   blindness  
  9.A _________ mirror is curved outward.  
  a.   plane  
  b.   spherical  
  c.   concave  
  d.   convex  
  10.Which of the following uses a concave mirror?  
  a.   reflecting telescope  
  b.   telephoto lens  
  c.   space telescope  
  d.   refracting telescope  
  11.A __________ lens is thicker in the middle than at the edges.  
  a.   spherical  
  b.   concave  
  c.   plane  
  d.   convex  
  12.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.   No light rays pass through the image.  
  d.   Rays of light meet at the image.  
  13.Which of the following concave lenses forms a virtual image?  
  a.   object between one and two focal lengths  
  b.   object beyond three focal lengths  
  c.   object within one focal length  
  d.   object between two and three focal lengths  
  14.What type of image does a microscope form?  
  a.   real diminished  
  b.   real enlarged  
  c.   virtual diminished  
  d.   virtual enlarged  
  15.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.  
  16.The __________ is an imaginary straight line perpendicular to the center of a concave mirror.  
  a.   optical axis  
  b.   tangent  
  c.   ray  
  d.   focal point  
  17.A _________ mirror is a flat, smooth mirror.  
  a.   convex  
  b.   concave  
  c.   spherical  
  d.   plane  
  18.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.   inverted and smaller than the object  
  c.   enlarged and inverted  
  d.   upright and smaller than the object  
  19.A __________ lens is thinner in the middle and thicker at the edges.  
  a.   spherical  
  b.   convex  
  c.   concave  
  d.   plane  
  20.A _________ mirror is curved inward.  
  a.   conical  
  b.   concave  
  c.   plane  
  d.   convex  

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