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Calculate the angle at which (a) first o...

Calculate the angle at which (a) first order reflection and (b) second order reflection will occur in an X-ray spectrometer when X-ray of wavelength `1.54A^@` are diffracted by the atoms of a crystal, given that the interplanar distance is `4.04A^@`.

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`10^@59. , 22^@24`
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