What is refraction of light?

When light travels from one material to another, it refracts - it bends and changes speed.

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What factors affect how much light refracts?

  1. The refractive index of the material.
  2. The angle light enters the material.

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What is refractive index?

A measure of how much light refracts when passing from one material to another.

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How can you find the refractive index of a material?

  1. Measure the angle of incidence of light between the incident ray and the normal.
  2. Measure the angle of refraction between the refracted ray and the normal.
  3. refractive index = sin (r)sin (i)​

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What equipment is used to investigate refraction?

  1. Glass block
  2. Ray box
  3. Protractor
  4. Ruler

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What does the gradient on a sin(i) vs sin(r) graph represent?

The gradient equals the refractive index of the material.

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