A transparent slab of thickness d and refractive index n moves at a speed v along the

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A transparent slab of thickness d and refractive index n moves at a speed v along the x axis relative to a stationary reference frame, with the flat face of the slab perpendicular to the x axis While the slab is moving, a light pulse traveling along the x axis impinges on the slab, travels through it, and reaches a detector a distance L away from the source of the light pulse How long does it take for the light pulse to reach the detector