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As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?

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A wave equation can be expressed as a differential equation. The super position principle follows from the linear character of the wave equation. If y1 and y2 are the solutions of the wave equation, then their any linear combination is also the solution of the wave equation.

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