PH-1716
Total internal reflection
Physics · Secondary 4 · Medium · Total internal reflection
A light ray in glass (refractive index 1.50) is incident on a glass–air boundary at . The critical angle for glass–air is .
What happens to the ray at the boundary?
What happens to the ray at the boundary?
- It is totally internally reflected in the glass.
- It refracts into the air, bending towards the normal.
- It refracts into the air, bending away from the normal.
- It passes straight through without changing direction.
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