c) Refractive index

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Last updated 10:23 PM on 6/30/26
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5 Terms

1
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  • define refractive index

  • how strongly a material refracts light passing through it

  • → the density of a material

2
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  • state the formula for refractive index

  • n = c/v

    • refractive index of a material = speed of light in a vacuum (ms-1) / speed of light in the material (ms-1)

3
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  • state the formula for refractive index including the critical angle

  • n = 1/sinC

    • refractive index = 1/sine of the critical angle ()

4
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  • state the law of refraction

  • when light passes through a boundary

  • → ratio of the sine of the angle of incidence to the sine of the angle of refraction = constant

5
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  • state the formula for the law of refraction

  • n1sinθ1 = n2sinθ2

    • refractive index of incident material × sine of the angle of incidence (°) = refractive index of refractive material × sine of the angle of refraction (°)