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Chapter 18: Mirrors and Lenses

Practice Test
  1.__________ is located behind a convex mirror.  
  a.   The focal point  
  b.   A ray  
  c.   A real image  
  d.   The object  
  2.A concave lens is also known as a __________ lens.  
  a.   converging  
  b.   concave  
  c.   plane  
  d.   diverging  
  3.The focal length of a concave lens is __________.  
  a.   negative  
  b.   magnified  
  c.   positive  
  d.   reduced  
  4.A 10-cm object has a 20-cm image. What is the magnification?  
  a.   2  
  b.   1/2  
  c.   10  
  d.   20  
  5.An image of a flower is seen through a lens. What is the object?  
  a.   a mirror  
  b.   a lens  
  c.   an image  
  d.   a flower  
  6.Farsightedness can be corrected with a __________.  
  a.   convex lens  
  b.   parabolic lens  
  c.   concave lens  
  d.   plane lens  
  7.Unlike mirrors, lenses have __________.  
  a.   one focal point  
  b.   no focal points  
  c.   many focal points  
  d.   two focal points  
  8.The image from a convex mirror will _________.  
  a.   always be virtual  
  b.   always be real  
  c.   always be projected  
  d.   never be virtual  
  9.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.   1.3 m  
  d.   4.0 m  
  10.Why are bigger lenses better for observing dim objects?  
  a.   they collect more light  
  b.   they have better curvatures  
  c.   they refract light less  
  d.   they reduce spherical aberration  

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