Question: In Figure two isotropic point sources S1 and S2 emit light in phase at wavelength A and at the same amplitude. The sources are separated
In Figure two isotropic point sources S1 and S2 emit light in phase at wavelength A and at the same amplitude. The sources are separated by distance 2d = 6.00λ. They lie on an axis that is parallel to an x axis, which runs along a viewing screen at distance D = 20.0λ. The origin lies on the perpendicular bisector between the sources. The figure shows two rays reaching point P on the screen, at position xp.
(a) At what value of xp do the rays have the minimum possible phase difference?
(b) What multiple of λ gives that minimum phase difference?
(c) At what value of xp do the rays have the maximum possible phase difference? What multiple of λ gives?
(d) That maximum phase difference and
(e) The phase difference when xp = 6.00λ?
(f) When xp = 6.00.tr, is the resulting intensity at point P maximum, minimum, intermediate but closer to maximum, or intermediate but closer to minimum?

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