A ray of light is incident at an angle of incidence $60^{\circ}$ on the glass slab of refractive index $\sqrt{3}$. After refraction, the light ray emerges out from other parallel faces and lateral shift between incident ray and emergent ray is $4 \sqrt{3} \mathrm{~cm}$. The thickness of the glass slab is $\_\_\_\_$ cm.
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