In Young's double slit experiment, slits are separated by 2 mm and the screen is placed at a distance of 1.2 m from the slits. Light consisting of two wavelengths 6500 Å and 5200 Å are used to ob

Question

In Young's double slit experiment, slits are separated by 2 mm and the screen is placed at a distance of 1.2 m from the slits. Light consisting of two wavelengths 6500 Å and 5200 Å are used to obtain interference fringes. Then, the separation between the fourth bright fringes of two different patterns produced by the two wavelengths is

TestHub · Accepted Answer

y 4 = 4 D λ d Separation between the fourth bright fringes = 4 D λ 1 d - 4 D λ 2 d 4 D d λ 1 - λ 2 = 4 × 1.2 2 × 10 - 3 6500 - 5200 × 10 - 10 = 3120 × 10 - 7 = 0.312 mm

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