How does light travel according to the provided information?

Light travels primarily in straight lines, which is known as the rectilinear propagation of light. This concept is crucial in understanding how light behaves in various contexts, such as in optics and vision. Straight-line propagation means that when light travels, it will continue in one direction unless it encounters an obstacle or a medium that alters its path.

When light interacts with different materials, it can undergo refraction, which is the bending of light as it passes from one medium to another (for example, from air into water). This bending occurs due to changes in the speed of light as it moves through substances of different densities. Additionally, light can be reflected, meaning it bounces off surfaces, such as mirrors, allowing us to see images.

The other choices may incorporate some truths about light, such as light's wave characteristics or its ability to scatter in certain situations, but they do not capture the fundamental way light primarily travels in straight lines and changes direction under specific conditions like refraction and reflection.