You place a piece of hair on a slide so that it essentially makes a double slit (the slits are to either side of the hair}. Your hair is 28.5 \"mand represents the slit separation. A screen is then set-up 3.50 m from the centre of the sources and a diffraction pattern is created. You observe that a point on the fifth nodal line is 3?.5 cm from the centre of the interference pattern. Determine the wavelength of the light used and identify its colour