Question 19

The distance between two slits in Young's double slit experiment is $$d = 2.5$$ mm and the distance of the screen from the plane of slits is $$D = 120$$ cm. The slits are illuminated with coherent beam of light of wavelength $$\lambda = 600$$ nm. The minimum distance (from the central maximum) of a point where the intensity reduces to 25 percent of maximum intensity is

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