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1) What are interference and diffraction? Under what circumstances do they occur?

2) Light from a helium-neon laser is shined on a slit of width .02 mm. Describe qualitatively the pattern of light seen on a screen 1.0 meter away.

3) How would the pattern in (2) be different if the slit were .06 mm wide instead of .02 mm?

4) How would the pattern in (2) be different instead of one slit, there were two slits, each .02 mm wide, separated by .2 mm?

5) How would the pattern in (4) be different if there were two slits, each .02 mm wide, separated by .4 mm? 6) How does the width of the slits affect the intensity pattern of a two-slit interference pattern?

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