Let's calculate the Miller indices of the yellow plane.
The intercepts are $(2,2,1)$ . Taking the reciprocals we get $1/2,1/2,1$ . Clearing the fractions I get the indices as $(1,1,2)$. Why then does the figure show a different indices? Am I supposed to clear fractions as I've done? I'm finding conflicting answers on the net.
Could anyone please help me understand this? A similar way to calculate Miller indices as I've done is shown here
Image credits: Mr porphyrin.