1. Recall that if light is shined onto appropriately close together double slits

Question

1.                  Recall that if light is shined onto appropriately close together double slits, the pattern on the screen shows up as light and dark fringes as shown in the diagram.

a.       If light of 650nm is shined onto these double slits which are 9mm apart onto a screen 1 meter away, locate how far (to 3 sig figs) from the center the first 4 bright fringes are.

m =

Distance from center

b.      Now, because in reality each individual slit of the double slit is, in fact, a real slit with real width, then a Single Slit diffraction pattern should also show up on the screen.  Recall that the single slit pattern looks like the diagram below.  Locate the first minima (dark fringe) for the single slit diffraction pattern if the individual slits are 3mm wide:

c.         Now, what will show up on the screen will be a combination of the two patterns where the single slit pattern

m =

Distance from center

Explanation / Answer

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You can see the reference here , which explains the concepts :)

web.whittier.edu/physics/zorba/275hw2Sol.pdf

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