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The slits in a double-slit interference ...

The slits in a double-slit interference experiment are illuminated by orange light `(lambda = 60 nm)`. A thin transparent plastic of thickness t is placed in front of one of the slits. The nunber of fringes shifting on screen is plotted versus the refractive index `mu` of the plastic in graph shown in figure. The value of t is

A

4.8 mm

B

`640 mu m`

C

`24 mu m`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
c
N = no. of fringes shifted
shift of central maxima `= n lambda = (mu - l) t`
`implies t = 24 mu m`.
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