PH-480
Total internal reflection
Physics · Secondary 3 · Medium · Total internal reflection
A light ray in glass (refractive index 1.5) is incident on the glass–air boundary at . The critical angle for glass–air is . What happens to the ray at the boundary?
- It is totally internally reflected.
- It is partially reflected and partially refracted into the air.
- It passes straight through without changing direction.
- It is completely absorbed at the boundary.
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