# Answer to Question #76607 in Material Science Engineering for Aanvi

Question #76607

Determine the conditions governing geometrical structure factor for an fcc lattice. Is reflection observed from the (111) and (211) planes of the fcc structure?

Expert's answer

**Condition for governing geometrical structure factor for FCC lattice is either all even or all odd Miller indices.**

Since Miller indices(111) are all odd so reflection occur from that plane

But Miller indices(211) is the mixed of even and odd so the reflection is forbidden means reflection is not occur from the plane

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