Two wavelengths λ₁ and λ₂ are used in Young's double slit experiment. λ₁ = 450 nm and λ₂ = 650 nm. The minimum order of fringe produced by λ₂ which overlaps with the fringe produced by λ₁ is n. The value of n is .

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Accepted Answer

9. Bright fringes overlap when nλ₂ = mλ₁. 650n = 450m ⇒ 13n = 9m. Smallest integers: n = 9, m = 13. → 9

Two wavelengths λ₁ and λ₂ are used in Young's double slit experiment. λ₁ = 450 nm and λ₂ = 650 nm. The minimum order of fringe produced by λ₂ which overlaps with the fringe produced by λ₁ is n. The value of n is ______.

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