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Refraction of Light (Grades 11-12)

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Refraction of Light

When you see a straw in a glass of water it looks bent, why is this?
  1. diffraction
  2. reflection
  3. refraction
  4. polarization
Light travels through all transparent media at the same speed.
  1. True
  2. False
What is refraction? Include a real world example as part of your explanation.

How light propagates through a material is given by the ratio of the speed of light in vacuum to the speed of light in that material. What is this ratio called?
  1. reflection ratio
  2. ratio of bending
  3. light speed index
  4. refractive index
The imaginary line perpendicular to the boundary of two materials or to a reflective surface is called the                .
  1. normal
  2. phase line
  3. refractive path
  4. reflection path
When a light ray traveling along the normal hits the boundary of two materials, it changes its                  but not its                         .
When a ray of light passes from air, a less dense medium, to glass, a more dense medium, the ray of light will bend                 the normal.
  1. towards
  2. away from
What occurs when the angle of incidence of a light ray is greater than the critical angle?
  1. critical refraction
  2. total internal reflection
  3. total external reflection
  4. dispersion
The refractive index of water will change with its temperature due to the change in density of its molecules.
  1. True
  2. False
Some fiber optic cables are made with various materials arranged in such a way that the refractive index of the cable changes gradually. These are called                                fibers.
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