Diffraction Grating

An object with periodic optical properties, e.g. grooves. Seperates light into its component wavelengths through the process of diffraction and interference.

• Think of the way a CD looks. This is because it is a Diffraction Grating
• Related Absorption Spectroscopy Construcive coherent intereference occurs if

$$k(AB-CD)=2(m\in \mathbb{Z})\pi$$

Diffraction Grating Equation

$$a(\sin ({\theta }_m)-\sin ({\theta }_i))=m\lambda$$