Shock waves are steep wavefronts that are fundamental in nature, especially in high-speed fluid flows. When a shock hits an obstacle, or a flying body meets a shock, shock reflection/diffraction ...

The diffraction spikes so familiar to us in space images are an intrinsic property of the telescope. Reflecting telescopes have two mirrors: a large primary and a smaller secondary. Light hits the ...

Light is a form of energy without it we cannot see things around us. Light enables us to see objects from which it comes or from which it is reflected. We detect light with our eyes. When light falls ...

As the result of the measurements to be described, it has been established that reflection and diffraction by mountains takes place to an extent which was not fully appreciated hitherto. In these ...

FROM the first investigations of G. P. Thomson 1 dealing with the structure of surface layers up to the present time, the method of using a specimen ground flat has remained apparently without change ...