Light is understood to propagate as a wave, with photons acting as quantized excitations of this wave. While light spreads out and its intensity decreases with distance, it never completely vanishes; it simply becomes indetectably weak. The concept of light as "little bullets" is a misunderstanding, as photons do not behave like discrete particles in the classical sense. Geometric optics provides a useful approximation for light behavior, especially in interactions with mirrors, but this does not encompass the full complexity of light's wave-particle duality. Modern quantum theory has evolved beyond early interpretations, emphasizing that photons are not localized and their properties are better described by wave equations.