A monochromatic X-ray beam with the wavelength 1.585 A is incident on an Aluminium crystal and is parallel to the (010) planes. When the incident beam makes and angle of 11.31° with the [100] direction, there is a diffracted beam that is also parallel to the (010) planes. Give the indices of this reflex, i.e. which set of planes are giving rise to the diffraction?
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Do it directly considering the diffraction formula.
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