Chapter 76 of 2364 min read
Diffraction and polarisation
Why this is asked: Polarisation only happens for transverse waves, and the fact that light can be polarised is itself the proof light is transverse. In single-slit diffraction, a sinθ = nλ locates the minima, not the maxima — the reverse of double-slit's condition for maxima.
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- •An unpolarised light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then:
- •The intensity of transmitted light when a polaroid sheet is placed between two crossed polaroids at from the polarisation axis of one of the polaroids is ( is the intensity of polarised light after passing through the first polaroid):
- •An unpolarised light beam strikes a glass surface at Brewster's angle. Then:
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