What is the order of the ring, Physics

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Q. In Newton's ring experiment, the diameter of certain order of dark ring is measured to be double that of  the second ring. What is the order of the ring?

Data :              dn = 2d2 ; n = ?

dn2 = 4nRλ

d22 = 8Rλ

   dn2 / d22 = n / 2

            ( 4d22 / d22 ) / ( n / 2)

∴ n = 8.


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