State law of Malus. (ii) Draw a graph showing the variation of intensity (I) of polarized light transmitted by an analyzer with angle

Question

(i) State law of Malus.

(ii) Draw a graph showing the variation of intensity (I) of polarized light transmitted by an analyzer with angle (θ) between polarizer and analyzer.

(iii) What is the value of refractive index of a medium of polarizing angle 60°?

Answer 1

(i) When the pass axis of a poloroid makes an angle θ with the plane of polarisation of polorised light of intensity I₀ incident on it, then the intensity of the transmitted emergent light is given by I = I₀cos² θ