Density of hvdrogen at T-0C temperature and atmospheric pressure is ?,-0.0000896 gr/cm3 and index of refraction n-1.000138. Density of liquefied hydrogen is pz-0.068 gr/cm3. Given that Lorenz-Lorentz formula is valid for this case (formula that relates index of refraction and atomic parameters for solid-state case, in Hecht's book formula #3.74) find index of refraction of liquefied hydrogen.

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