Refractive Index:
When a ray of light passes from one medium to another, refraction occurs that is, the ray is bent at the interface. The refractive index is a measure of how greatly a substance slows the velocity of light.
Glass has higher refractive index
- Air: 1
- Water: 1.2
- Glass: 1.5
The direction and magnitude of bending is determined by the refractive indices of the two media forming the interface.
When light passes from air into glass, a medium with a greater refractive index, it is slowed and bent toward the normal, a line perpendicular to the surface
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