A new way of bending X-rays raises the prospect of smaller, more powerful X-ray space telescopes. Based on technology originally developed for medical imaging machines, Stacked Prism Lens are being ...

THIS useful book on geometrical optics has been enlarged and improved by the addition of two new chapters. One of these deals with the microscope considered as being more or less typical of optical ...

THERE are two criteria for estimating the value of Dr. Silberstein's latest work. On one hand it possesses great theoretical interest, yet on the other it lays claim to practical usefulness. One must ...