Diffraction: bending of light around obstacles/slits. Single slit: central bright maximum (widest), secondary maxima. Condition for dark fringe: a sinฮธ = nฮป (a=slit width). Polarization: transverse nature of light. Polaroid transmits only one plane of vibration. Brewster's law: tanฮธ_B = n (ฮธ_B = polarizing angle).
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