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Chapter 17: Reflection and Refraction

Practice Test
  1.According to Snell's law, light traveling from a vacuum to glass will __________.  
  a.   speed up  
  b.   travel at the same speed  
  c.   slow down  
  d.   stop completely  
  2.If a refracted ray moves away from the normal, the speed of light of the ray in this material is __________ that of the incident ray.  
  a.   the same as  
  b.   unrelated to  
  c.   greater than  
  d.   less than  
  3.If a substance has a critical angle of 50°, what happens to the light from an incident angle hitting the boundary at 30°?  
  a.   it is reflected  
  b.   it is refracted  
  c.   it is diffused  
  d.   it is stopped  
  4.The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.  
  a.   normal angle  
  b.   refracted angle  
  c.   critical angle  
  d.   reflected angle  
  5.What is the purpose of cladding in an optical fiber?  
  a.   causes total internal reflection  
  b.   prevents reflection  
  c.   reduces refraction  
  d.   prevents scattering of light  
  6.Your image in a bathroom mirror results from __________.  
  a.   diffuse refraction  
  b.   regular refraction  
  c.   diffuse reflection  
  d.   regular reflection  
  7.A light ray traveling through crown glass (n = 1.52) intersects a sheet of flint glass (n = 1.61) at an angle of 27.3°. What is the angle of refraction?  
  a.   0.839°  
  b.   25.7°  
  c.   33.0°  
  d.   0.433°  
  8.Water is more optically dense than air. Therefore, the speed of light in water is __________.  
  a.   the same as the speed of light in a vacuum  
  b.   slower than the speed of light in air  
  c.   faster than the speed of light in air  
  d.   the same as the speed of light in air  
  9.What is the speed of light in a diamond (n = 2.42)?  
  a.   7.26 × 108 m/s  
  b.   3.00 × 108 m/s  
  c.   2.42 × 108 m/s  
  d.   1.24 × 108 m/s  
  10.A ray of sunlight travels through air and intersects the surface of water at a small incident angle. The ray is __________.  
  a.   incident  
  b.   reflected  
  c.   pure  
  d.   refracted  

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