In Young's double slit experiment, the distance between the slits is 1.2 mm and the screen is 0.75 m from the slits. If the distance of the 5ᵗʰ bright fringe from the central fringe on the screen is 1.8 mm. Calculate the wavelength of light used. What will be the distance of the 5ᵗʰ dark fringe from the centre of the screen?
