Discord\( \pmb{n = \frac{c}{V}} \) - Refractive index
\( \pmb{n_1 \alpha = n_2 \beta} \) - Snell's Law
\( \pmb{D = \frac{1}{F}} \) - Optical power of a lens
\( \pmb{\frac{1}{F} = \frac{1}{d} + \frac{1}{f}} \) - Thin lens equation
\( \pmb{\beta = \frac{ \vert f \vert }{ \vert d \vert} \text{ = } \frac{H}{h}} \) - Magnification of a lens
\( \pmb{\Delta = L_2 = L_1} \) - Path difference in interference
\( \pmb{d \sin{\phi_m} = m_{max} \lambda} \) - Diffraction grating equation
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