The wavelength of the emitted waves is λ = 2cm. a) If interference at point P is constructive, what is the path-length difference s = r2 – r1. Express your answer in terms of λ. b) Consider similar triangles ABD and EPC. Use their similarity to express the path-length difference s in terms of L, d and y. If L is much larger than distance between sources d you may assume that the length EP ≈ L c) Now combine expressions form a) and b) to find the possible positions y where you observe the maximum signal (constructive interference) d) Find the position of the maximum closest to point C if λ = 2cm, L = 10m, and d = 10cm.

The wavelength of the emitted waves is λ = 2cm. a) If interference at point P is constructive, what is the path-length difference s = r2 – r1. Express your answer in terms of λ. b) Consider similar triangles ABD and EPC. Use their similarity to express the path-length difference s in terms of L, d and y. If L is much larger than distance between sources d you may assume that the length EP ≈ L c) Now combine expressions form a) and b) to find the possible positions y where you observe the maximum signal (constructive interference) d) Find the position of the maximum closest to point C if λ = 2cm, L = 10m, and d = 10cm.

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