Determine the X, Y, Z tristimulus values and x, y chromaticity coordinates for each of the following. Show the locations on a chromaticity plot. a) One unit of light at = 490 nm

b) One unit of light at = 560 nm

c) One unit of light at = 490 nm plus one unit of light at = 560 nm

d) Two units of light at = 490 nm plus one unit of light at = 560 nm

e) For parts c) and d) determine the approximate dominant wavelength and the excitation or color purity associated with each of the resulting colors.