Measurement of wavelength of monochromatic light, Physics

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Q. Measurement of Wavelength of Monochromatic Light?

Monochromatic Light is allowed to fall on plate G1. The M.I. is adjusted for circular fringes. For this mirror M1 is made exactly perpendicular to mirror M2 with the help of leveling screw and movable mirror M1 is moved in such a way so that G1M2 = G1M1.

Consequently circular fringes are observed when viewed through telescope.

Suppose the separation between real mirror M1 and image of mirror M2, M2' is such that a nth order dark ring is formed at the centre in the field of view. Thus the conditions for dark fringe at centre.


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