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Chapter 18: Mirrors and Lenses

Practice Test
  1.An achromatic lens corrects chromatic aberration using __________.  
  a.   two concave lenses with the same index of refraction  
  b.   no lenses  
  c.   two convex lenses with the same index of refraction  
  d.   a combination of concave and convex lenses with different indices of refraction  
  2.The image from a convex mirror will _________.  
  a.   always be projected  
  b.   always be real  
  c.   always be virtual  
  d.   never be virtual  
  3.What is f if you have an object 2.0 m from the concave mirror, and the image is 4.0 m from the mirror?  
  a.   0.67 m  
  b.   2.0 m  
  c.   4.0 m  
  d.   1.3 m  
  4.The image produced by the ocular of a microscope is a(n) __________.  
  a.   real image  
  b.   reflected image  
  c.   object image  
  d.   virtual image  
  5.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   20  
  b.   1/2  
  c.   2  
  d.   10  
  6.The refractive indices of lenses are __________.  
  a.   the same as air  
  b.   independent of the refractive index of air  
  c.   greater than air  
  d.   less than air  
  7.Spherical aberration can be avoided by using a __________.  
  a.   parabolic mirror  
  b.   plane mirror  
  c.   spherical mirror  
  d.   convex mirror  
  8.Unlike mirrors, lenses have __________.  
  a.   two focal points  
  b.   one focal point  
  c.   no focal points  
  d.   many focal points  
  9.Real images produced by mirrors have __________ magnification.  
  a.   positive  
  b.   massive  
  c.   negative  
  d.   opposite  
  10.A concave lens is also known as a __________ lens.  
  a.   diverging  
  b.   concave  
  c.   converging  
  d.   plane  

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