A parallel beam of light is travelling along a direction making an angle of `30^(@)` with the positive X direction and `60^(@)` with positive Y direct
A parallel beam of light is travelling along a direction making an angle of `30^(@)` with the positive X direction and `60^(@)` with positive Y direction. Wavelength is `lambda`. Find the phase difference between points having co-ordinates `(1, sqrt( 3) , 2) "and" (0, 0, 0)`.
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