q in newtons ring experiment the diameter of


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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Physics: q in newtons ring experiment the diameter of
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