White light is incident on a narrow slit. After passing through the slit it forms a diffraction pattern on the wall a distance D = 1.8 In away from the slit. It is noticed that the first minimum for the wavelength A = 610 nm occurs x = 1.3 cm above the central maximum. 5% l l 3 l l c: at --------------------------- a: 3::h D Figure 1. A single slit of width 0 a distance D from an observation screen. The slit is centred at x = 0 and the point of interest is at x = h. The sketch is not to scale: D is >> a and >> x. Part 1) What is the width of the slit 0? Part 2) Which wavelength will have its first diffraction maxima at this same point (x = h)? Part 3) If the entire apparatus is now submerged in water with a refractive index n = 1.33, how far from the central maximum will the first minima for the light with A = 610 nm in air be? h=:cm