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Refractive Index
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- 1REFRACTION is caused by the WAVES CHANGING SPEED. REFRACTION is when the waves CHANGE DIRECTION as they ENTER A DIFFERENT MEDIUM.1. When waves slow down they bend towards the normal.
2. When light enters glass or plastic it slows down to about 2/3 of its speed in air.
3. If a wave hits a boundary at 90 degrees (i.e. along the normal) it will not change direction- but it will slow down.
4. When light hits a different medium (e.g. plastic or glass) some of the light will pass through the new medium but some will be reflected - it depends on the angle of incidence (the angle it hits the medium). - 2Every Transparent Material has a REFRACTIVE INDEX
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