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Yadunandan Mutti
Asked: 2022-10-29T00:25:35+05:30 In:

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
image
A. 4.8 mm
B. `640 mu m`
C. `24 mu m`
D. none of these

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
image
A. 4.8 mm
B. `640 mu m`
C. `24 mu m`
D. none of these
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1 Answer

  1. Correct Answer – c
    N = no. of fringes shifted
    shift of central maxima `= n lambda = (mu – l) t`
    `implies t = 24 mu m`.

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