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(A) In a single-slit Fraunhofer diffraction,the condition for the $n^{th}$ order minima is given by the equation $a \sin 	heta = n\lambda$,where $a$

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$n\lambda$

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(A) In a single-slit Fraunhofer diffraction,the condition for the $n^{th}$ order minima is given by the equation $a \sin 	heta = n\lambda$,where $a$ is the slit width,$	heta$ is the angle of diffraction,and $\lambda$ is the wavelength of light.Here,$a \sin 	heta$ represents the path difference between the secondary wavelets originating from the edges of the slit.Therefore,for the $n^{th}$ order minima,the path difference is equal to $n\lambda$,where $n = 1, 2, 3, ...$.

In a Fraunhofer's diffraction obtained by a single slit aperture,the value of path difference for $n^{th}$ order of minima is

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