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The condition for constructive interference in thin filmis,
m = 0,1,2,....
From equation (1) putting the value of t in the above equation we get,
since n = 1 for air film
or
For first bright ring, m = 0
For second bright ring, m = 1
For third bright ring, m = 2
Similarly, for Nth bright ring,
m = N - 1
Radius for dark ring
The condition for destructive interference in thin filmis,
2tn = mλ m = 0,1,2,....
By putting the value of t, we get,
For air n = 1
For i.e. point of contact.
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∙ 10y ago
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∙ 10y agoby substitue the values of R,D
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