The slits in a double-slit interference experiment are illuminate… - Vidyadip

MCQ

The slits in a double-slit interference experiment are illuminated by orange light $(\lambda = 600\ nm)$. A thin transparent plastic of thickness $t$ is placed in front of one of the slits. The number of fringes $(N)$ shifting on screen is plotted versus the refractive index $μ$ of the plastic in graph shown. The value of $t$ is

A
$4.8\ mm$
B
$48\ μm$
C
$2.4\ μ\ m$
✓
$24\ μm$

✓

Answer

Correct option: D.

$24\ μm$

d
Shift of central maxima $ = n\lambda = \left( {\mu - 1} \right)t$

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