When you change the amplitude of light, it refers to modifying the intensity or brightness of the light wave. The amplitude of a light wave determines the extent of its displacement from the equilibrium position. Increasing the amplitude makes the light wave brighter, while decreasing the amplitude reduces its brightness.
However, it's important to note that changing the amplitude of light does not alter its fundamental properties, such as its wavelength or frequency. The wavelength of light remains constant, determining its color, while the frequency determines the energy of the photons that comprise the light.
In practical terms, modifying the amplitude of light can be achieved through various means. For example, in the case of visible light, you can adjust the brightness of a light source like a lamp or adjust the intensity of light passing through a filter or lens. In digital systems, you can change the amplitude of light waves by adjusting the signal strength or power level when transmitting optical signals through fiber-optic cables or other optical devices.
In summary, changing the amplitude of light affects its brightness or intensity, but not its color or energy characteristics.