When two or moare than two wvaes supermpose over each other at a common partile of the medium then the resultant diaplacement (y) of the particle is equal to the vector sum of the displacements (y1 and y2) produced by personal rays. i.e. ![379_Wave optics3.png](https://www.expertsmind.com/CMSImages/379_Wave%20optics3.png)
![865_Wave optics.png](https://www.expertsmind.com/../CMSImages/865_Wave optics.png)
Important Terms:
1. Phase : The argument of sine or cosine in the expression for displacement of a wave is defined as the phase. For displacement y = asinωt; term ωt= phase or instantaneous phase.
2. Phase difference (Φ) : The difference between the phases of two waves at that position is called phase difference i.e. if y1 = a1sinωt and y2 = a2sin(ωt+Φ) so phase difference ¾ Φ
3. Path difference (D) : The difference in path length's of two waves meeting at that position is called path difference between the waves at that position. Also ![1382_Wave optics1.png](https://www.expertsmind.com/../CMSImages/1382_Wave optics1.png)
4. Time difference (T.D.) : Time difference between the waves meeting at a point is ![38_Wave optics2.png](https://www.expertsmind.com/../CMSImages/38_Wave optics2.png)
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