Q. 19

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Answer :

Let A_|| denote amplitude of parallel polarization A_⊥ denote amplitude of perpendicular polarization.

Hence, resultant amplitude A is

Without P,

where A¹ and A² are amplitude of two beams.

Now,

Intensity, I

With P, is blocked, then the intensity is given by

Given, (intensity without polariser at principal maxima)

Now,

i.e.,

Intensity at principal maxima with polariser is

Intensity at first minima with polariser is

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