The light refracts when the light goes through mediums with different refractive indices.
the refractive index for air: 1
the refractive index for water: 1.333
the refractive index for glass: 1.4 - 2.0
媒質と入射角によっては、全反射(光が屈折して進むのではなく、全て反射する)となることがあります。
Here is an equation for reflection. (Incidence angle:θ1, refraction angle:θ2, Refractive index of incident medium: n1, Refractive index of reflection medium: n2)
sin(θ2) = sin(θ1) * n1 / n2
When sin(θ2) > 1, then no θ2 exists. The light is reflected at the boundary. This phenomenon is called "total reflection."
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