one beam of coherent light travels path P1 in arriving at poin Q and another coherent beam travels parth P2 in arriving at the same point. In these two beams are to interfere constructively
, the path difference P1-P2 must be equa to
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A rectangular plane surface 2m wide and 3m deep lies in water in such a way that its plane makes an angle of 30◦ with the free surface of water. Determine the total pressure and position of center of pressure when the upper edge is 1.5m below the free water surface.
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