What is the refractive index of a material?
The refractive index of a material is a measure of the speed of the light as it passes through that material, as compared to the speed of light as it passes through a vacuum.
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What does a high refractive index mean?
A high refractive index means that light travels more slowly through that material.
(for example, diamond has a refractive index of 2.4 - which is considered very high)
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What does a low refractive index mean?
A low refractive index means that light travels quickly through that material.
(for example ice has a refractive index of 1.3, which is considered low)
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What is the refractive index of a vacuum?
A vacuum has a refractive index of 1.0, which is the lowest value possible.
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What is Snell's Law?
Snell's Law is an equation that links the refractive index (n), angle of incidence (i), and angle of refraction (r). So if you know any two of n, i or r, you can work out the missing one.
n = sin(i) รท sin(r)
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