The definition of the refractive index is η = c/v.
The speed of light in a denser medium is less so that it covers a small distance.
Therefore, as the ray enters a rarer to denser medium, it bends towards the normal.
Below is a ray diagram showing the refracted ray as it travels across the diamond. The dashed line represents the normal to the surface between the water and the diamond. Complete the diagram by adding the incident ray.
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