PH-484
Total internal reflection
Physics · Secondary 3 · Medium · Total internal reflection
A light ray in glass (refractive index 1.5) 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?
- Totally internally reflected in the glass.
- Refracted into the air, bending towards the normal.
- Refracted into the air, bending away from the normal.
- Passes straight through without changing direction.
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