Past exam of the physics A course of the University of Cambridge / 2013 / Paper 2 / Section A / 1

The wavelength is $\lambda =c/f\simeq 0.020\mathrm{m}$. The longest interferometric baseline measures the finest angular structure and the shortest-baseline angular scale describes the coarsest:These are order-of-magnitude scales, not sharp cutoffs. A commonly used maximum-recoverable-scale convention is $0.6\lambda /B_{\min }$, giving about $8.2^{\prime }$; reconstruction also depends on baseline coverage and source structure. The individual antenna's primary beam is a separate field-of-view limit.^[ref]