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 : d_n = 2d₂ ; n = ?

d_n² = 4nRλ

d₂² = 8Rλ

d_n² / d₂² = n / 2

( 4d₂² / d₂² ) / ( n / 2)

∴ n = 8.

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