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Physics Definitions

Wattles Current : The component of current (i.e. Iv Sin ф) which does no useful work in an a.c. circuit is called wattles current.
Wave Optics (or Physical Optics) : The branch of optics is concerned with the nature of light and involves primarily the theory of waves. It deal with the phenomena like interference, diffraction, polarisation etc. It is also called physical optics.
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