Contents: Preface. 1. Albert Einstein: Person of the Century. 2. Einstein’s Annus Mirabilis. 3. The Mass Energy Relation: E = mc2 • Introduction • Simple Examples to Understand the Equation E = mc2 • Simple Derivation of the Equation E = mc2 • Problems. 4. Fusion and Fission: Energy from our Sun and from the Atomic Bomb • Introduction • Energy Emitted by our Sun • How was the Sun Created? • Energy Released in a Fission Process • A Bit of History. 5. Einstein’s Light Quantum • Introduction • The Corpuscular Model of Light • The Wave Model • Thomas Young’s Famous Interference Experiment • Maxwell’s Electromagnetic Waves • The Concept of Polarization • Einstein’s Light Quantum • De Broglie’s Hypothesis • Diffraction by a Single Slit • The Double Slit Interference Pattern • The Beam Splitter Experiment • The Polarization of a Photon. 6. Einstein’s Special Theory of Relativity I: Time Dilation and Length Contraction • Introduction • Speed of Light for a Moving Source • Time Dilation • The Mu Meson Experiment • The Length Contraction • Understanding the Mu-Meson Experiment via Length Contraction • Length Contraction of a Moving Train • Simultaneity of Two Events • The Twin Paradox • The Michelson Morley Experiment • Brief Historical Remarks • Problems. 7. Einstein’s Special Theory of Relativity II: Lorentz Transformations • Introduction • The Lorentz Transformations • Transformation Laws for the Components of the Momentum Vector • Addition of Velocities • Problems. References. Index. Special Theory of Relativity and Quantum Theory are considered as the two major revolutions of the 20th century. Roger Penrose wrote “Albert Einstein had such extra-ordinary deep perceptions of the workings of Nature that he laid foundation stones for both of these twentieth century revolutions in the single year of 1905”. The year 1905 was Einstein’s Annus Mirabilis (Year of Miracles) when he was working, in almost total isolation, in the Swiss Patent Office. In this small book, the author - Ajoy Ghatak gives the basic physics and consequences of his revolutionary contributions in his Year of Miracles: E=mc2, The Light Quantum & Special Theory of Relativity.