Now look at the waves emitted from two identical sources(e.g., two identical rocks that fall into a lake at the same time).The sources emit identical waves at the exact same time.
Identify whether the waves interfere constructively ordestructively at each point A to D.
For points A to D enter eitherc for constructive or d for destructiveinterference. For example if constructive interference occurs atpoints A, C and D, and destructive interference occurs at B, entercdcc.
