Distinguish between a wavefront and a Ray of light. State the assumptions of huygens principle. With the help of diagram explain the construction of 1)plane and 2)circular wavefronts. A and B are two points on water surface waves are generated. What is phase difference if a)A and B are on the same wavefront but separate in distance by wavelength Lambda b) if A and B are on successive crests, but linearly separated by distance 2.5 Lambda?
