00:01
So, it has been asked to sketch the 0 1 1 bar 1 and 2 1 bar 1 bar 0 planes in a hexagonal unit cell.
00:19
Now coming to the plane 0 1 1 bar 1, its indices along a1, a2, a3 and c axis which are this is one axis, this is another one, these are the planar comprising the plane and this is the c axis.
00:46
So, this is a1, this is a2, this is a3 and this is c.
00:51
The indices are 0 1 minus 1 or 1 bar and 1.
00:56
Its reciprocals are 1 by 0 that is infinity, 1 by 1 that is 1, 1 by minus 1 that is minus 1 and 1 by 1 is 1.
01:07
So, reciprocals as multiples of lattice parameters a1, a2, a3 are having the same lattice parameter let it be a and c.
01:22
Then these reciprocals are infinity a minus a and a.
01:27
So, this is a, this is also a and then it is parallel to a1 axis and this is c...