First slide

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

Question

A thin mica sheet of thickness $2 \times 10^{- 6} m$ and refractive index $(μ = 1.5)$ is introduced in the path of the first wave. The wavelength of the wave used is $5000 Å.$ The central bright maximum will shift

Moderate

A

2 fringes upward
B

2 fringes downward
C

10 fringes upward
D

None of these

Solution

$Shift = \frac{β}{λ} (μ - 1) t$
$= \frac{β}{(5000 \times 10^{- 10})} \times (1 .5) \times 2 \times 10^{- 6} = 2 β,$
i. e., 2 fringes upwards.

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