Refraction and angle of incidence When a ray of light is incident at normal incidence, (at right angles), to the surface between two optical materials, the ray travels in a straight line.

Conclusion We can see from the graph that as the angle of incidence, i, increases, the angle of refraction, r, also increases. This agrees with our prediction. However, the angle of incidence is ...

The law of refraction first derived by Snellius and later introduced as the Huygens–Fermat principle1, states that the incidence and refracted angles of a light wave at the interface of two ...