(a) Why does unpolarised light from a source show a variation in intensity when viewed through a polaroid which is rotated? Show with the help of a diagram, how unpolarised light from sun gets linearly polarised by scattering.
(b) Three identical polaroid sheets are oriented so that the pass axis of and are inclined at angles and respectively with the pass axis of .
A monochromatic source S of unpolarized light of intensity is kept in front of the polaroid sheet as shown in the figure.
Determine the intensities of light as observed by the observer at O, when Polaroid is rotated with respect to at angles and