Quation $2$

$($a$)$ Consider the simple cubic crystallographic unit eetls with unit cell cedge length $a,$ shown in Figures Q$2($a$)$ and Q$2($b$)$ below. Determine the Miller Indices for the erystallographic direction $AB$ sbown in Figure Q$2($a$)$ and the crystallographic plane ABC shown in Figure Q$2($b$),$ clearly showing the steps involved in cach case.

$|6|$