(a) Using the phenomenon of polarisation, show how transverse nature of light can be demonstrated? (b) Two polaroids P1 and P2 are placed with their pass axes perpendicular to each other. Unpolarised light of intensity I0 is incident on P1 . A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle of 30° with that of P1 . Determine the intensity of light transmitted through P1, P2 and P3 .

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.