Which one of the following is the big disadvantage of the Debye-Scherrer cameras?

Which one of the following is the big disadvantage of the Debye-Scherrer cameras? Correct Answer Divergent diffracted beams

The big disadvantage of early Debye-Scherrer cameras is that incident and diffracted beams are inevitable, somewhat divergent and of low intensity. In diffractometer and the modern focusing cameras, a convergent X-ray beam is used.
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