The amplitude of the wave is indicated by the blue arrow.

The Amplitude of a wave is the vertical height of the wave from the normal to its highest peak. In other words, it is the distance from the normal to the trough of the wave or from the normal to the crest of the wave. It is also measures the intensity, the brightness, of the light wave. Meaning the larger the amplitude the brighter the light, the smaller the amplitude the dimmer the light. For example, the headlights of the car, the high beam and the regular lights, the high beam is much brighter than the regular car lights. This shows that the amplitude of the high beam is much larger than the regular car lights.


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