Monochromatic light is incident normally on a slit (Figure 4)

Monochromatic light is incident normally on a slit (Figure 4). A screen is located far away from the slit. The mirror produces a virtual image of the slit. (a) Is the virtual image coherent with the slit itself? (b) Is the pattern on the screen a double-slit interfer- ence pattern or a pair of single-slit diffraction patterns? (c) If the pattern is an interference pattern, is the fringe closest to the mirror surface bright or dark? Explain your answer. (This arrangement is known as Lloyd's mirror.) S mirror screen