The light that is illuminating an object or surface, coming from all directions. The color of the incident light is one factor in the perception of the color of the object. An object's color is a function of the wavelengths that a particular material absorbs and reflects (i.e., whatever wavelengths an object doesn't absorb will be reflected). White light, containing all the wavelengths of visible light, falling on an apple will have the blue and green wavelengths absorbed by the apple, reflecting back the red wavelengths.
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