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7. In a double slit interference experiment, the separationbetween the slits is 1:0 mm, the wavelength of light usedis 50 × 10-' m and the distance of the screen from. theslits is 1 0 m. (a) Find the distance of the centre of thefirst minimum from the centre of the central maximum.(b) How many bright fringes are formed in onecentimeter width on the screen?ment two narrow vertical

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