Superposition and Resultant amplitude

Conditions for good interference 

Resultant wave of two 1d waves traveling in the same direction 

1d superposition of waves generated by two coherent sources 

Superposition of waves from two sources

Phet - two slit interference 

Path difference and resultant amplitude 

Constructive interference and ladder of frequencies 

Some terminology 

Terminology for phase differencies 

Fringe patterns and frequency ladders

Overlapping waves.

What a coherent source of waves means?       

Superposition principle.

Addition of the individual displacements at any point.

Vector model for the resultant amplitude.

Path difference.

Conditions for maxima and minima.

Constructive interference          Ares = 2A     If path difference is integer number wavelengths

Destructive  interference         Ares = 0        If path difference is half integer number wavelengths

Phase difference

Derivation of position dependent formula for Resultant Amplitude of interference of two waves in terms of path difference.

Resultant amplitude  in terms of phase difference:       Ares = 2A* | cos(phi/2) |