BITSAT 2019 Slot 2 Solved Paper

When two waves with same frequency and constant phase difference interfere to each other, then after interference, intensity of resultant wave is distributed such that it is maximum at some points [constructive interference or bright fringes] and minimum at another points.
[destructive interference or dark fringes].
Hence, energy is distributed and remains constant [in the form of bright and dark fringes]