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I can describe and explain when refraction happens and when total internal reflection happens at boundaries between media.
Muuji qoraalka
At a boundary to a medium where the wave speed increases, waves are refracted away from the normal.
If the angle of incidence is too big (bigger than the critical angle) the waves will undergo total internal reflection.
The critical angle is the greatest angle of incidence before total internal reflection occurs.
For a glass–air boundary, the critical angle (c) is about 42°.
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