1.

In Young's double-slit experiment, a point in the fringe pattern is one-third of the fringe width fr9m the central bright fringe. The phase difference between the interfering waves at the point is

Answer»

`(pi)/(6)` rad
`(pi)/(3)` rad
`(pi)/(4)` rad
`(2pi)/(3)` rad

Solution :`X=(X)/(3).""THEREFORE " path difference, " Delta=(XD)/(D)=(X)/(3) cdot (d)/(D)=(lamdaD)/(3D) cdot (d)/(D)=(lamda)/(3).`
`therefore" Phase difference "=(2pi)/(lamda)xxDelta =(2pi)/(3)` rad.


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