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Two oblong pieces of plane glass are separated from each other by a thin sheet of cellophane and held together with rubber bands, as shown in figure(I provided a website for the figure below), where the amount of separation is much exaggerated. If you place a "sodium vapor lam" vertically above the glass plates, you will observe an alternate series of very close bright and dark lines. A light wave is reflected at point A and simply forms a returning wave. Some of the original light wave crosses the narrow air gap and is reflected at point B. If it advances across the air gap as a trough, then it is reflected at point B as a crest.
Question: The length of the wedgeshaped space between the two glasses is l, the thickness of the thin sheet of cellophane is d, and the distance between point C and point A (or B) is x as shown in the figure.Supposing the result is destructive interference or darkness. Find the relation between x, [tex]\lambda[/tex],l and d.
My idea:
I think their relation is x=[tex]\frac{l}{2d} \lambda(n + \frac{1}{2}) [/tex]
This is the website: www.geocities.com/willydavidjr/interference.html
Question: The length of the wedgeshaped space between the two glasses is l, the thickness of the thin sheet of cellophane is d, and the distance between point C and point A (or B) is x as shown in the figure.Supposing the result is destructive interference or darkness. Find the relation between x, [tex]\lambda[/tex],l and d.
My idea:
I think their relation is x=[tex]\frac{l}{2d} \lambda(n + \frac{1}{2}) [/tex]
This is the website: www.geocities.com/willydavidjr/interference.html
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