Observe the figure and name the ray \( \text{AB} \), ray \( \text{CD} \), ray \( \text{GH} \): .
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In refraction, the incident ray strikes the surface, the refracted ray bends inside the medium, and the emergent ray exits the medium. The change in speed and direction of light when it moves between different media is key to understanding refraction.
Ray \( \text{AB} \): This is the incident ray, which is the light ray that approaches the surface of the glass slab and strikes it.
Ray \( \text{CD} \): This is the refracted ray, which is the light ray that bends as it enters the glass slab, due to the change in the speed of light when moving from one medium (air) to another (glass).
Ray \( \text{GH} \): This is the emergent ray, which is the light ray that exits the glass slab after it has been refracted inside the slab.
The phenomenon of refraction occurs due to the change in the speed of light as it moves from one medium to another with a different refractive index.
