A _thin lens_ is a [lens](Lens.md) which we model as an infinitely thin plane. This consideration is referred to as the _thin lens approximation._ # ABCD matrix The [ABCD matrix](Ray%20transfer%20matrix.md) for a thin lens is $M=\begin{pmatrix}1 & 0 \\ -\frac{1}{f} & 1 \end{pmatrix}$ #Electromagnetism/Optics #ExperimentalTools/ExperimentalToolsinOptics