First slide

In YDSE one of the slits is covered with a thin transparent sheet

Question

If a thin mica sheet of thickness t refractive index $μ$ (=5/3) is placed in the path of one the interfering beam as shown in fig (1), then the displacement of
the fringe system is

Moderate

A

$\frac{Dt}{3 d}$
B

$\frac{Dt}{5 d}$
C

$\frac{Dt}{4 d}$
D

$\frac{2 Dt}{5 d}$

Solution

$S = (μ - 1) t (D / 2 d) = (5 / 3 - 1) t (D / 2 d) = \frac{Dt}{3 d}$

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