Question: Using a diffractometer and a radiation of wavelength 1 . 5 4 , only one reflection from an FCC material is observed when 2 is

Using a diffractometer and a radiation of wavelength 1.54, only one reflection from an FCC material is observed when 2 is 121. What are the indices of this reflection? What is the interplanar spacing? Show that the next higher index reflection cannot occur.

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