We now come to a small booklet titled Problems of Wave Optics by S. E. Frish. The book starts with history of wave theory and contributions of various people like Huygens, Young, Fresnel, Newton and takes on the theoretical framework which explains the observed phenomena.This booklet acquaints the reader in a popular form with the basic features of modern wave theory of light. New advances in optics, in particular sources of coherent radiation, lasers, are discussed, and prospects outlined for their application in photography and microscopy.The booklet is intended for specialists, students school teachers and a wide range of readers interested in problems of theoretical and experimental physics.This book is a part of a series called as "Knowledge Series" the logo is a at top right corner of cover.The book was translated from the Russian by V. Kisin and was first published by Mir in 1976 with  a second reprint in 1982.Contents Introduction 7 Basic Features of the Wave Theory of Light 10 Classical Experiments on Interference of Light 24 Optical Image 30 Image and Its Processing from the Stand point of the Theory of Information 39 The Use of Phase Relations 47 Lasers as Sources of Coherent Radiation 53 Holography 60