The first ever thoroughly revised and expanded edition of one of the classic books on optics of the twentieth century. New material includes an account of the CAT scan (computerized axial tomography). An expanded section on diffraction, including an account of the Rayleigh-Sommerfeld theory. Explanation of effects of spatial coherence on the spectrum of light, illustrated by Young's interference experiment with broad-band light. New chapter on both scalar and electromagnetic scattering, including derivation and discussion of the optical cross-section theorem, development of the Born and the Rytov series, definitive account of diffraction tomography. New appendices include an account of energy conservation in scalar wavefields Jones'lemma on asymptotic behaviour of certain integrals.