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 mmB. `640 mu m`C. `24 mu m`D. none of these

The slits in a double-slit interference experiment are illuminated by

1.	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 mmB. `640 mu m`C. `24 mu m`D. none of these
Answer» 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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