Summary
Highlights
The video begins by introducing the electromagnetic (EM) wave diagram, which illustrates that EM waves (like light or radio waves) consist of both an electric component and a magnetic component, oscillating at 90 degrees to each other as the wave propagates.
The speed of light in a vacuum is highlighted as a fundamental constant, approximately 3.00 x 10^8 meters per second. This means light travels 300 million meters in just one second.
The video then demonstrates how the speed of light changes when it passes through different materials. Using a laser and a glass prism, it explains that light slows down in optically dense materials. This slowing down is quantified by the refractive index (n), which is the ratio of the speed of light in a vacuum to the speed of light in the specific material. A higher refractive index indicates that light slows down more in that material, leading to greater refraction or bending of light.