As the amplitude of a light wave increases, the light appears brighter.
What is amplitude?
The amplitude is the vertical distance from the axis of the sinusoidal wave at a particular time.
When the amplitude of a wave is increased, its energy is increased. Energy of the wave is directly proportional to the square of the amplitude. Energy is actually the intensity of the wave.
Thus, as the amplitude of a light wave increases, the light appears brighter.
Learn more about amplitude.
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