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A)Describe what phenomenon is observed in the Figure 5 (a-d)

B) Determine what happens to the double-slit interference pattern if one of the slits is covered
with a thin, transparent film whose thickness is λ/[2(n-1)], where λ is the wavelength of the
incident light and n is the index of refraction of the film.

(a)
(b)
2
-2
-2-
6
10
12
14
16
18
20
10
12
14
16
18
20
multiples of pi
multiples of pi
(c)
(d)
2
-2
-2 -
6.
8.
10
12
14
16
18
20
6.
10
12
14
16
18
20
multiples of pi
multiples of pi
2.
2.
2.
amplitude [a.u.]
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2.
2.
amplitude [a.u.]
amplitude [a.u.]

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