Show that when two in-phase linearly polarised light waves are superposed, the resultant wave has fixed orientation as well as amplitude. Depict the orientation of electric field vector of the resultant wave in the reference plane.

When two in-phase linearly polarized light waves are superposed, the resultant wave exhibits fixed orientation and amplitude. Let's consider two such waves with their electric field vectors aligned along the same direction. ___ ____ __________ ___ ______.
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