LIGO Phase Shifts

If the laser light used in Advanced LIGO is \(1064 \text{ nm}\), an arm of the detector is \(4 \text{ km}\) long, and the GW150914 system causes strains \(h = 10^{-21}\), what is the phase shift in laser light traversing a detector arm at maximum displacement versus no displacement, in radians?

\(\)
See Gravitational Waves.

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