PHYSICS- INTERFERENCE: Basics: Interference, Destructive Interference, Constructive Interference, Wave Motion, Wavefront and types, Path Difference, Phase Difference, Superposition Principle, Coherent Sources and its conditions, Methods of obtaining Coherent sources, Young's Double Slit Experiment, Condition for constructive and destructive interference, Expression for Fringe Width, Types of Interference; Division of wave front-Fresnel's biprism, Division of amplitude – Newton's rings, Michelson interferometer, applications.