Find the number of bright fringes formed over the 120mm distance.

Asked by devjuly | 9th Jun, 2011, 09:07: PM

Expert Answer:

In the case of varible thickness,
Fringe width = lamda/ 2mu theta = y/l
Let N be the number of fringes formed over length l,
l = N beta 
N = 2mu l tbeta/lamda
N = 2X 1X0.048X10^-3/(680X 10^-9) = 141

Answered by  | 13th Jun, 2011, 01:40: PM

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