A ray of light is incident on equilateral triangular prism
- A ray of light is incident on an equilateral triangular prism parallel to its base
- A ray of light is incident on an equilateral triangular glass prism
- A ray of light incident on the face ab of an equilateral triangular prism
- Light is incident on an equilateral glass prism at a 45.0 ∘ angle to one face
- A light ray enters an equilateral glass prism