Theory of Interference is explained with the help of some basic supporting physical concepts, mentioned here are; 1. Coherent sources, 2. Superposition Principle 3. Young’s Double Slit Experiment Geometry 4. Basic trigonometric relations
What we are concluding here; on the basis of theory of Interference we are concluding that light energy also remains conserved by the help of Intensity distribution at different angles (or at path differences).