Find the value of D if the wave length of the wave is 40m, n=2 m and the angles are given as θ1 = 0˚, θ2 = 180˚.

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1.	Find the value of D if the wave length of the wave is 40m, n=2 m and the angles are given as θ1 = 0˚, θ2 = 180˚.
A.	50m
B.	40m
C.	20m
D.	10m
Answer» B. 40m

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