Let A|| denote amplitude of parallel polarization A⊥ denote amplitude of perpendicular polarization.
Hence, resultant amplitude A is
where A1 and A2 are amplitude of two beams.
With P, is blocked, then the intensity is given by
Given, (intensity without polariser at principal maxima)
Intensity at principal maxima with polariser is
Intensity at first minima with polariser is
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