File:Triplet prism with refraction angles.svg

A triplet prism, showing the apex angles (${\displaystyle \alpha _{1}}$, ${\displaystyle \alpha _{2}}$, and ${\displaystyle \alpha _{3}}$) of the three elements, and the angles of incidence ${\displaystyle \theta _{i}}$ and refraction ${\displaystyle \theta '_{i}}$ at each interface. The deviation angle of the ray transmitted by the prism is shown as ${\displaystyle \delta }$.

Own work

2011

NathanHagen

See below.