What is Rectilinear Propagation of Light?

Rahul Prabhakar
2 min readJul 17, 2023

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Rectilinear Propagation of Light

Scientists and philosophers have both been fascinated by the mystifying and perplexing phenomenon of light for millennia. We can understand the basic nature of our reality and the mysteries of the cosmos via the intriguing study of how light behaves.

Rectilinear propagation is one of the fundamental theories guiding the movement of light. It refers to the idea that light moves in straight lines in the simplest sense.

The idea of rectilinear propagation has its origins in the fact that light is a particle. Depending on the characteristics of the substance it interacts with, a photon may reflect, refract, or absorb when it comes into contact with an item. Understanding how light behaves is essential to comprehending how we perceive objects and the environment.

Rectilinear light propagation is essential for many real-world uses. Think of the camera obscura as an early kind of imaging. An inverted picture is projected onto a screen or surface opposite the opening by light passing through a small hole known as the aperture.

Due to light’s ability to travel in a straight path, this phenomenon is feasible. Similar to how the operation of optical fibers, telescopes, and microscopes depends on the knowledge of rectilinear propagation, the capacity to direct and control light relies on the idea that light moves in straight lines.

While rectilinear propagation seems to be a basic characteristic of light in our daily lives, it is important to remember that light can display behaviors other than straight lines.

Refraction occurs when light refracts across a media with different refractive indices, such a prism, and causes a deviation from the original path. This phenomenon is what causes rainbows and the mesmerizing play of colors when light is refracted through a prism, as well as the lovely breakdown of light into its individual colors.

How Rectilinear Propagation of Light Works?

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Rahul Prabhakar
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I specialize in writing articles on Educational and all things related to technology. My articles are for everyone who wants to gain knowledge.