A beam of monochromatic light, whose wavelength in free space is A, issplit into two separate beams and each is then passed through identicaltroughs of water. Show that if the water in one trough is stationary andthe water in the other trough is moving with speed v («c) in thedirection of the light, the phase difference between the emerging beams isAp - (2L/A)(n² – 1(v/c),where L is the length of the troughs and n is the refractive index of thestationary water. Suggest suitable values for L and v in an experimentalarrangement for verifying this result.

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