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in Physics by (61.3k points)

Suppose in the double-slit arrangement, d = 0.150 mm , D = 120 cm , λ = 833 nm, and y = 2.00 cm .

(a) What is the path difference δ for the rays from the two slits arriving at point P ?

(b) Express this path difference in terms of λ

(c) Does point P correspond to maximum, a minimum, or an intermediate condition? 

1 Answer

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(a) The path difference is given by δ = d sin θ . When D >> y,θ is small and we can make the approximation sin θ = tan θ = y/D. Thus,

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