Incident light refers to the light that falls on a surface from an external source. It is an essential factor in determining how an object appears to the human eye. There are several synonyms associated with incident light, such as ambient light, natural light, and environmental light. These terms are often used interchangeably to describe light sources that are not artificially generated. Another common synonym for incident light is illuminance, which describes the measurement of the amount of light falling on a surface. In photography, lighting is key, and understanding the various synonyms of incident light is crucial for achieving optimal results.