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4. (20 pts) Light of 600nm is incident on two slits each of width 1.2 pum and separated by 3.6 μm. On a screen 1 m from the plane of the slits locate the positions of the first three interference maxima on either side of the central maximum that are visible on the screen. If instead of two slits there were 10 slits of the same width and spacing, how would the pattern change? (would the pattern spread out, compress; would the interférence maxima change location, get broader, narrower, etc)
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