a
એક પ્લેટ ના લીધે શિફ્ટ \(\Delta {{\text{x}}_{\text{1}}}\,\, = \,\,\frac{{\left( {{n_1}\,\, - \,\,1} \right)\,\,t\,D}}{d};\,\,\)

બીજી પ્લેટ ના લીધે શિફ્ટ \(\Delta {x_2}\,\, = \,\,\frac{{\left( {{n_2}\, - \,\,1} \right)\,\,tD}}{D}\)

પરિણમી શિફ્ટ \(\Delta x\,\, = \,\,\Delta {x_2}\,\, - \,\,\Delta {x_1}\,\, = \,\,\left( {{n_2}\,\, - \,\,{n_1}} \right)\,\,\frac{{tD}}{d}\,\,\sim A\)

પણ અહી શિફ્ટ \(\Delta x\,\, = \,\,5\,\,\frac{{\lambda D}}{d}\)

તેથી \(\frac{{\left( {{n_2}\,\, - \,\,{n_1}} \right)\,\,tD}}{d}\,\, = \,\,\frac{{5\,\lambda D}}{d}\)

\(\therefore \,\,t\,=\,\frac{{5\lambda }}{{\left( {{n_2}\,\, - \,\,{n_1}} \right)}}\,\, = \,\,\frac{{5\,\,\, \times \,\,4800\,\, \times \,\,{{10}^{ - 10}}}}{{\left( {1.7\, - \,\,1.4} \right)}}\,\, = \,\,8\,\, \times \,\,{10^{ - 6}}\,\,m\,\, = \,\,8\,\,\mu m\)