The higher the density of a material - The slower the wave travels, The frequency of the wave - Always stays the same, If a wave hits a boundary at an angle - The speed, direction and the wavelength change, The normal is - The imaginary line that angles are measured from., When a wave moves from air to glass at an angle - It bends towards the normal, When a wave moves from glass to air at an angle - It bends away from the normal, If a wave is traveling along the normal - The speed changes but the direction will stay the same.,

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