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(B) The distance of the $n^{th}$ bright fringe from the central maxima is given by the formula: $x_n = \frac{n \lambda D}{d}$.Here,$n = 3$,$\lambda =

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$3.6$

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(B) The distance of the $n^{th}$ bright fringe from the central maxima is given by the formula: $x_n = \frac{n \lambda D}{d}$.Here,$n = 3$,$\lambda = 6000\ \mathring A = 6000 	imes 10^{-10}\ m$,$D = 1.0\ m$,and $d = 0.5\ mm = 0.5 	imes 10^{-3}\ m$.Substituting these values into the formula:$x_3 = \frac{3 	imes 6000 	imes 10^{-10} 	imes 1.0}{0.5 	imes 10^{-3}}$$x_3 = \frac{18000 	imes 10^{-10}}{0.5 	imes 10^{-3}}$$x_3 = 36000 	imes 10^{-7}\ m = 3.6 	imes 10^{-3}\ m = 3.6\ mm$.Therefore,the separation is $3.6\ mm$.

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