# Diffraction from a Straightedge

Photograph of light diffracted by a straightedge. The intensity distribution follows ${|\mathcal{F}\left(x\right)|}^{2}$, where $\mathcal{F}$ is the Fresnel integral (See 7.3.4). Fresnel integrals have many applications in optics. The faint circular patterns are additional diffraction effects due to imperfections in the edge.