Refraction is caused by the waves changing speed and direction and going into a different medium eg. solid to gas.
When waves SLOW DOWN they bend towards the NORMAL
When LIGHT enters the GLASS or PLASTIC it SLOWS DOWN
If a wave HITS a BOUNDARY at 90degrees, it will NOT change direction.
When the light hits a DIFFERENT MEDIUM some of the light will PASS THROUGH the new medium & some REFLECTED.
IT ALL DEPENDS ON THE ANGLE ON INCIDENCE (ANGLE IT HITS)
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