When a ray of light is incident at normal incidence, (at right angles), to ... When the ray is incident at any other angle, the ray changes direction as it refracts. The dotted line is the normal ...

Plot a graph of angle of incidence, i in o on the y-axis against angle of refraction, r in o on the x-axis and draw the line of best fit. We can see from the graph that as the angle of incidence ...