Write the relationship between angle of incidence 'i', angle of prism 'A' and angle of minimum deviations $\Delta m$ for a triangular prism.

The relation between the angle of incidence i, angle of prism $A$ , and the angle of minimum deviation $\Delta m$Δm, for a triangular prism is given by

$i=\frac{A+\Delta m}{2}$