1. (a) The diagram below shows the intensity pattern recorded on a viewing screen when an InGaN diode laser operating at A = 405 nm (as used, for example, in a Blu- ray Disc drive) illuminates an opaque plate with some slits in it. The pattern was viewed on a screen 2.00 m from the plate. Intensity 0.02 -0.01 0 0.01 0.02 Position (m) (i) Point out the key features of the pattern and describe which properties of the slits lead to each of these features. (ii) From this diagram, determine as accurately as you can the values of A. the slit spacing, and B. the slit width. (b) The diode laser laser can in principle also emit at a wavelength of A = 450 nm. (i) Describe how the pattern would be changed for this new wavelength. (ii) If the laser could produce both spectral lines at once, could you resolve the spectral lines using this pattern of slits? Explain your reasoning. (iii) How would you change your pattern of slits to be able to resolve these two spectral lines