PH-477
Total internal reflection
Physics · Secondary 3 · Medium · Total internal reflection
In an optical fibre, a light ray in glass (refractive index 1.50) strikes the glass–air boundary at an angle of incidence of . The critical angle for glass–air is . What happens to the ray at the boundary?
- It is totally internally reflected in the glass.
- It is partially reflected and partially refracted.
- It is completely refracted into the air.
- It is absorbed at the boundary.
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