2 points Question 1 Light from a helium-neon laser is shined on a slit of width

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2 points Question 1 Light from a helium-neon laser is shined on a slit of width 0.02mm. Describe qualitatively the pattern of light seen on a screen 1.0meter away- Assume that the slit is vertical. The pattern on the wall looks like a fuzzy slit, but turned on its side (so it is much broader than it is tall) . The pattern looks exactly like the original slit, just bigger. . The pattern on the wall has a broad central spot, with a series of dimmer spots on either side. The pattern on the wall has the same shape as the slit, but fuzzier as well as bigger. 2 points Save M Question 2 How would the pattern in the last question be different if the slit were 0.06mm wide instead of 0.02mm? Again assume that the slit is vertical. It would look very similar but 9 times broader (including nine times more space between dark spots if any.) It would be hard to tell any difference because the slits are so small anyway. It would look very similar but 9 times narrower (Including nine times less space between dark spots if any.) The width of the pattern is about the same, but it is three times taller. It would look very similar but 3 times broader (including three times more space between dark spots if any.) The width of the pattern is about the same, but it is about a third as tall. It would look very similar but 3 times narrower (including three times less space between dark spots if any.) 2 points Save M Question 3 How would the pattern In the second question be different if instead of one slit, there were two slits, each 0.02mm wide, separated by 0.2mm. Again assume that the slits are vertical. The pattern looks the same, just brighter because the light is coming from two slits instead of one. You would see the one-slit pattern appearing twice, separated by a little distance. You would see lots of little lines within each of the bigger lines you see with one slit. The lines that you see with one slit would be small lines within the thicker ones that appear with two slits. points Save M Question 4 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 The big envelope becomes narrower, so that fewer of the small lines fit within it. The big envelope becomes wider, so that more of the small lines fit within it. The thinnest lines would be half the distance apart, so there are more of them in each big envelope The thinest lines would be twice as far apart, so there are fewer of them in each big one. Nothing changes: the same amount of light comes through the slits.

Explanation / Answer

1) b

2) e

3) c

4) d

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