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Polarization of Light

Problem 5.198

A tube of length l=26 cml=26 \mathrm{~cm} is filled with benzene and placed in a longitudinal magnetic field of a solenoid positioned between two Polaroids. The angle between the principle directions of the Polaroids is equal to 45∘.45^{\circ} . Find the minimum strength of the magnetic field at which light of the wavelength 589nm589 \mathrm{nm} propagates through that system only in one direction (optical valve). What happens if the direction of the given magnetic field is changed to the opposite one?

Reveal Answer
5.198. Hmin⁡=π/4Vl=4.0kA/m,H_{\min }=\pi / 4 V l=4.0 \mathrm{kA} / \mathrm{m}, where VV is the Verdet constant. The direction along which the light is transmitted changes to the opposite.
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