Science Home Product Information Site Map Search Contact Us   Glencoe Online
Quizzes Quiz
Chapter 17: Reflection and Refraction

Practice Test
  1.What does Snell's law compare?  
  a.   the density of the materials  
  b.   the cosines of the refracted angles  
  c.   the sines of the refracted angles  
  d.   the reflective nature of materials  
  2.What is the speed of light in a diamond (n = 2.42)?  
  a.   7.26 × 108 m/s  
  b.   1.24 × 108 m/s  
  c.   3.00 × 108 m/s  
  d.   2.42 × 108 m/s  
  3.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   refracted angle  
  b.   critical angle  
  c.   reflected angle  
  d.   normal angle  
  4.Why would it be impossible to have optical fibers filled with a vacuum?  
  a.   there is nothing less optically dense than a vacuum  
  b.   because optical fibers must use glass  
  c.   there is nothing for light to travel through  
  d.   because a vacuum is too optically dense  
  5.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   slow down  
  b.   speed up  
  c.   travel at the same speed  
  d.   stop completely  
  6.A light ray is traveling through an unknown material when it intersects ethanol (n = 1.36) at an incident angle of 62.0°. If the angle of refraction is 46.4°, what is the index of refraction of the unknown material?  
  a.   0.985  
  b.   1.12  
  c.   1.66  
  d.   2.00  
  7.Your image in a bathroom mirror results from __________.  
  a.   regular reflection  
  b.   regular refraction  
  c.   diffuse reflection  
  d.   diffuse refraction  
  8.Because of refraction, the Sun actually sets __________ we see it disappear.  
  a.   after  
  b.   before  
  c.   at the same time as  
  d.   hours before  
  9.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   pure  
  b.   refracted  
  c.   reflected  
  d.   incident  
  10.The line perpendicular to the reflective surface is the __________.  
  a.   line of incidence  
  b.   line of reflection  
  c.   normal  
  d.   line of refraction  

McGraw-Hill / Glencoe
The McGraw-Hill Companies