After tracing the path of a ray of light through a glass prism a student marked the angle of incidence ($\angle i$), angle of refraction ($\angle r$) angle of emergence ($\angle e$) and the angle of deviation ($\angle D$) as shown in the diagram. The correctly marked angles are:

The diagram shows the path of a ray of light through a glass prism. The angle of incidence ($\angle i$) is the angle between the incident ray and the normal to the surface of the prism. The angle of refraction ($\angle r$) is the angle between the refracted ray and the normal to the surface of the prism. The angle of emergence ($\angle e$) is the angle between the emergent ray and the normal to the surface of the prism. The angle of deviation ($\angle D$) is the angle between the incident ray and the emergent ray. Therefore, the correctly marked angles are $\angle i$, $\angle e$ and $\angle D$.