1.What is ‘α’ called? 2.What is ‘β’ called? 3.Define the term ‘refraction’ 4.α = 42 o, β = 30 o, v 1 = 7ms -1 and λ 1 = 2m. Using Snell’s law, calculate:

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Presentation transcript:

1.What is ‘α’ called? 2.What is ‘β’ called? 3.Define the term ‘refraction’ 4.α = 42 o, β = 30 o, v 1 = 7ms -1 and λ 1 = 2m. Using Snell’s law, calculate: a) v 2 b) λ 2 c) fd) T

Refractive Index Refraction is change in speed (and therefore direction) when waves move from medium to another. Refractive index is the ratio of the speed of waves in one medium to another.

Medium Absolute Refractive Index Air1.00 Water (liquid)1.33 Water (ice)1.31 Vegetable Oil1.46 Silica (quartz)1.46 Human Cornea1.38 Flint Glass1.65 Diamond2.42 Glycerol1.47

n 1, n 2, n 3, … = absolute refractive index 1 n 2 = relative refractive index where: Example: If light travels from water to diamond, what would be the relative refractive index?