File:Prism2.svg

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A doublet prism, showing the apex angles (${\displaystyle {\alpha }_1}$ and ${\displaystyle {\alpha }_2}$) of the two elements, and the angles of incidence ${\displaystyle {\theta }_i}$ and refraction ${\displaystyle \theta {\text{'}}_i}$ at each interface. The deviation angle of the ray transmitted by the prism is shown as ${\displaystyle \delta }$.

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