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Waves (Parts of a wave (Wavelength (m) – the distance between two points…
Waves
Parts of a wave
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Amplitude (m) – the height of the crest or depth of a trough, measured from the equilibrium position
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Reflection
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incident ray, reflected ray and normal all lie in the same plane
Refraction
Snell's law
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n is the refractive index – the relative velocity of the refracted ray compared with the incident ray
Snell's law can be used to predict when Total Internal reflection will occur – when the refracted ray would be at more than 90° to the normal
Happens when travelling from a slower-velocity medium to a higher-velocity medium and when greater than the critical angle
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