Measurement of difference in wavelength, Physics

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Measurement of Difference in Wavelength of Sodium D1 and D2 Lines: For the measurement of difference in wavelength of two closely spaced sodium lines firstly the M1 is adjusted for circular fringes.

For this mirror M1 and M2 should be perpendicular to each other and optical path G1M1 and G2M2' should be equal.


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