Two point sources S 1 and S 2 separated by a distance 10 μ m emit light waves of wavelength 4 μ m in phase. A circular wire of radius 40 μ m is placed around the sources as shown in figure, then ( O is the centre of the circle and O S 1 = O S 2 )

Question

Two point sources S 1 and S 2 separated by a distance 10 μ m emit light waves of wavelength 4 μ m in phase. A circular wire of radius 40 μ m is placed around the sources as shown in figure, then ( O is the centre of the circle and O S 1 = O S 2 ), Points A and B are dark and points C and D are bright, Points A and B are bright and point C and D are dark, Points A and C are dark and points B and D are bright, Points A and C are bright and points B and D are dark

MARKS App · Accepted Answer

In cases of B & D the path, the difference is zero so phase difference is also zero gives bright image while in case of A & C path difference is, 10 μm ⇒ ∆ p = 10 μm and we can calculate there are 10 4 λ = 5 2 λ , which gives dark fringe.

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