Which of the following is incorrect statement about the Bragg's equation \( n \lambda=2 d \sin \...

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Which of the following is incorrect statement about the Bragg's equation \( n \lambda=2 d \sin \theta \) ?
(1) \( \mathrm{n} \), represents order of reflection
(2) \( \lambda \), represents wavelength of UV-rays used
(3) \( \theta \), represents angle of incidence
(4) d, represents distance between two parallel planes
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