Experimenting with Refraction

The video tutorial explains the concept of refraction, which occurs when light bends due to a change in velocity at the boundary between two media. It introduces optical density as a measure of how much a medium slows light, affecting its refractive index. The tutorial illustrates refraction from low to high optical density, such as air to water, and from high to low density, like water to air, using a coin experiment. This experiment shows how light bends away from the normal, allowing the viewer to see the coin when water is added.

What new insight or understanding did you gain from this video?