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Which of the following graphs best repre...

Which of the following graphs best represent the variation of phase difference between he interferring waves in a double slit experiment with the distance from the central maximum?

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Phase difference
`triangle phi= (d sin theta)((2pi)/(lambda))= d tan theta*((2pi)/(lambda))" "(therefore y lt lt D therefore theta approx " small ")`
`=(dy)/(D)*((2pi)/(lambda))i.e., triangle phi propto y`,
The required graph is a straight line.
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