Refraction through a triangular prism
- The above figure shows a triangular prism with 2 triangular bases and 3 lateral rectangular surfaces.
- The surfaces are inclined at an angle of 60 degrees to each other.
- This is called the 'Angle of the prism'
- When a ray of light moves from one surface to another it bends. This is called Refraction
- The ray of light from air is incident on the glass surface AB. On hitting the surface AB, it bends towards the normal.
- At the surface AC, the light ray moves from glass to air. It again bends.
- T he angle of incidence (i), the angle of refraction (r) and the angle of emergence (e) is as shown in the figure.
- PQ is the incident ray
- QR is the refracted ray
- RS is the emergent ray.