BRAINCAKETotal Internal Reflection
When light travels from glass to air it refracts away from the normal.
If the angle of incidence reaches a critical angle then light refracts along the boundary.
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Key terms in this lesson
- Refractive index
- A measure of how much a substance slows down and bends light, equal to the ratio of the speed of light in a vacuum to the speed of light in the substance, or, at a boundary, sin i divided by sin r.