Plane-polarized light of wavelength 0.59m falls on a trihedral quartz prism P (Fig. 5.34) with refracting angle

Plane-polarized light of wavelength 0.59μm falls on a trihedral quartz prism P (Fig. 5.34) with refracting angle Θ = 30o. Inside the prism light propagates along the optical axis whose direction is shown by hatching. Behind the Polaroid Pol an interference pattern of bright and dark fringes of width ∆x = 15.0 mm is observed. Find the specific rotation constant of quartz and the distribution of intensity of light behind the Polaroid.