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(B) Bragg's law describes the condition for constructive interference of $X$-rays scattered by the atomic planes of a crystal.When an $X$-ray beam is

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$2d \sin 	heta = n\lambda$

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(B) Bragg's law describes the condition for constructive interference of $X$-rays scattered by the atomic planes of a crystal.When an $X$-ray beam is incident on a crystal at an angle $	heta$ with respect to the atomic planes,the path difference between the rays reflected from successive planes separated by a distance $d$ is $2d \sin 	heta$.For constructive interference,this path difference must be an integer multiple of the wavelength $\lambda$.Thus,the condition is $2d \sin 	heta = n\lambda$,where $n$ is an integer representing the order of reflection.

Bragg's law for $X$-rays is

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