Q1. How would the pattern be if instead of one slit, there were two slits, each 0.02mm wide, separated by 0.2mm. Again assume that the slits are vertical.
A) You would see the one-slit pattern appearing twice, separated by a little distance.
B) The pattern looks the same, just brighter because the light is coming from two slits instead of one.
C) You would see lots of little lines within each of the bigger lines you see with one slit.
D) The lines that you see with one slit would be small lines within the thicker ones that appear with two slits.
Q2. How would the pattern in the last question be different if instead of one slit, there were two slits, each 0.02mm wide, separated by 0.4mm (instead of 0.2mm). Again assume that the slits are vertical.
A) The thinnest lines would be half the distance apart, so there are more of them in each big envelope.
B) Nothing changes: the same amount of light comes through the slits.
C) The big envelope becomes narrower, so that fewer of the small lines fit within it.
D) The big envelope becomes wider, so that more of the small lines fit within it.
E) The thinest lines would be twice as far apart, so there are fewer of them in each big one