Which observation supports the idea that light is made of particles? Light is produced by the interaction of magnetic and electric fields Light spreads out after passing through an opening Light diffracts when it hits a barrier. Light moves in a straight path.

The observation that supports the idea that light is made of particles is that light moves in a straight path. This behavior is consistent with the particle theory of light, which states that light is composed of discrete particles called photons. When light encounters an obstacle, it behaves like a particle and travels in a straight line, rather than spreading out or diffracting like a wave.