The effect of radiation on the optical properties of glasses is very important as the response of the glasses to radiation is related to the rate of formation and accumulation of induced defects during progressive irradiation and hence the production of characteristic color center. In the present book, the effect of glass composition and gamma irradiation on the optical and physical properties of some selected borate and borosilicate oxide glasses have been explained. These glasses have potential application in the field of electronics, nuclear and solar energy technologies, acoustic-optic devices, microwave traveling wave tubes, microwave windows and plays major role as active materials in solid state electronic and ionic devices. The details of the book will be significant for under-graduate/ post-graduate students of Physics/ Applied Physics/ Material Science & Engineering. Extremely beneficial for future studies the glasses related to research as well as their applications in industries.