1
\begin{aligned}\mathrm{n}&=\frac{360^\circ}{\mathrm{\theta}}\\ \mathrm{N}&=\mathrm{n}-1 && \text{if n is even}\\ \mathrm{N}&=\mathrm{n}-1 && \text{if n is odd and placement is symmetrical}\\ \mathrm{N}&=\mathrm{n} && \text{if n is odd and placement is asymmetrical}\end{aligned}
2
\mathrm{f}=\frac{\mathrm{R}}{2}
3
\frac{1}{\mathrm{f}}=\frac{1}{\mathrm{v}}+\frac{1}{\mathrm{u}}
4
\mathrm{m}=\frac{\mathrm{h}_{\mathrm{i}}}{\mathrm{h}_{\mathrm{o}}}
5
\mathrm{m}=-\frac{\mathrm{v}}{\mathrm{u}}