Which lattice plane shows no diffraction peak in fcc crystal?

[doubt]

Consider x ray diffraction from a crystal with an fcc(face centered cubic) lattice.
The lattice plane for which there is NO diffraction peak is -

1. (2,1,2)
2. (1,1,1)
3. (2,0,0)
4. (3,1,1)

I think Bragg's law must be used. nλ=2d sinλθ.

 

[gomathy]

can anyone tell me how to calculate hkl values and hence a,b,c values using xrd powder pattern