refraction and TIR

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Last updated 12:09 PM on 4/2/26
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7 Terms

1
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what is refraction

The change of direction that occurs when lights passes at an an angle across a boundary between two transparent media which have different optical densities

2
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If a wave slows down at a boundary which way will it bend

Towards the normal

3
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If a wave speeds up at the boundary which way will it bend

Away from the normal

4
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Refractive index meaning

How much the substance willl slow down light compared to travelling in a vacuum

N = c (speed of light in a vacuum) / cs (speed of light in substance)

5
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Snells law

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6
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Conditions for total internal reflection

  • angle of incidence greater than critical angle

  • Substance has a larger refractive index

7
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Critical angle calculation

Sin(critical angle) = n2/n1