[" 4) (4) Consider sunlight incident on a slit of width "10^(4)A" .The image seen through the silithlal "],[" (a) be a fine sharp slit white in colour at the center."],[" (b) a bright slit white at the center diffusing to zero intensities at the edges."],[" (d) a bright slit white at the center diffusing to zegions of different colours."],[" (d) only be a diffused slit white in colour."],[" In a Young's double-slit experiment the fringe width is found to be "0.4mm" .If "]