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4. A double Nd:YAG laser (A = 532 nm) is used as the optical source in a Twyman-Green
interferometer. What would be the height of a surface defect to provide one half fringe
shift (e.g. from light to dark)?
Permittivity of free space
Permeability of free space
Velocity of light in vacuum
E0 8.85 x 10-12 Fm
Ho 47 x 10-7 Hm-!
3.00 x 10° ms-

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