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The figure shows a Young's double
slit experimental setup. It is observed
that when a thin transparent sheet of a Its)
Hepre
T
thickness t and refractive index u is
put in front of one of the slits, the
a(μµ − 1)
-
central maximum gets shifted by a
distance equal to n fringe widths. If the wavelength of light
used is λ, t will be
2nDλ
(a)
(b)
2Dλ
a(μ-1)
(c)
Dλ
a(µ − 1)
-
D
(d)
Screen
nDλ
a(μµ - 1)

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