What is the 'normal' - A dotted line drawn perpendicular to the surface of the refracting material, at the point of entry of the light, Angle of incidence, FAST-when light passes into a different density - Faster away from the normal slower towards the normal, Longitudinal wave, Transverse Wave, Period - The time for one wave to pass., Amplitude - Measures how much energy is in a wave., Frequency - The number of waves produced each second, The wave with the most radioactivity. - Gamma, The wave with the lowest frequency - Radio,

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