Using our mathematical terminology, we want R 1 – R 2 = 0, or R 1 = R 2. Find more videos@learnfatafat …alternately arrive in phase (constructive interference) and out of phase (destructive interference) as Earth rotates and causes a change in the difference in path from the radio source to the two elements of the interferometer. Whether constructive or destructive interference occurs at a point near the sources depends on the path-length difference, d, which is the distance from the point to one source minus the distance from the point to the other source. As we have seen, the simplest way to get constructive interference is for the distance from the observer to each source to be equal. Figure of constructive interference The conditions are: (1) there are at least two waves, (2) the waves are in different directions, and (3) the waves overlap. the interference of two or more waves of equal frequency and phase, resulting in their mutual reinforcement and producing a single amplitude equal to the sum of the amplitudes of the individual waves. There are no conditions for interference, including constructive and destructive interference, other than two waves passing through the same medium encountering each other. We again want to find the conditions for constructive and destructive interference. Learn conditions for constructive and destructive interference, topic helpful for cbse class12 physics chapter 10 wave optics. Bright or loud. Condition needed for constructive interference. However that’s only in real-time. Condition for constructive interference: d = ml, where m is any integer. The sources of the waves must be coherent, which means they emit identical waves with a constant phase difference. This is known as constructive interference, in which two waves (of the same wavelength) interact in such a way that they are aligned, leading to a new wave that is bigger than the original wave.