A wavefront is a line (or surface) of points that the wave reaches at the same instant — a crest line on the pond. From a point source the wavefronts are expanding circles; far from any source they are nearly straight. The wave propagates perpendicular to its wavefronts, successive crests apart.
বইগুলো এখনো বাংলা ভাষায় পাওয়া যায় না — ইংরেজি সংস্করণ দেখানো হচ্ছে।
Physics · পরিভাষা