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When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?

/ Physical Optics, Physics Mcqs / By
When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?

A. 5000 nm
B. 5000A
C. 500m
D. 2000um