1.what is ‘α’ called? 2.what is ‘β’ called? 3.define the term ‘refraction’ 4.α = 42...

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

1. What is ‘α’ called?

2. What is ‘β’ called?

3. Define the term ‘refraction’

4. α = 42o , β = 30o , v1= 7ms-1 and λ1 = 2m. Using Snell’s law, calculate:

a) v2 b) λ2 c) f d) T

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

Refractive IndexRefraction 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.

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

Medium Absolute Refractive Index

Air 1.00Water (liquid) 1.33

Water (ice) 1.31Vegetable Oil 1.46Silica (quartz) 1.46

Human Cornea 1.38Flint Glass 1.65Diamond 2.42Glycerol 1.47

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

n1 , n2 , n3 , … = absolute refractive index

1n2 = relative refractive index where:

Example:If light travels from water to diamond, what would be the relative refractive index?

1

221 n

nn

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