This Indian adaptation of the fourth edition of the book has been developed focusing on addition of new topics, and restructuring some of the existing concepts to make it a better-fit textbook for Indian universities. The section on the Schrödinger equation has been updated with more mathematical rigorous treatment. The section on Hydrogen Atom wave functions has been extended with detailed solutions of radial and Angular parts of the Schrödinger equation through new solved examples. The Chapter on solid state Physics now has extended discussion on crystal structures and lattice vibrations.