42. The lattice parameter of an ideal rhombohedrdron is 3Å. The interplanar
spacing between the consecutive (110) plane is:
(a) 2.12Å
(b) 3.12Å
(c) 4.12Å
(d) 5.12Å
43. The lattice parameter of an ideal rhombohedrdron is 3Å. The interplanar
spacing between the consecutive (111) plane is:
(a) 1.45Å
(b) 2.45Å
(c) 3.45Å
(d) 4.45Å
44. Show that the planes (321) and 23 1
ð
Þ belong to the zone:
(a) 111
½
Š
(b) 1 11
½
Š
(c) 1 1 1
½
Š
(d) 11 1
½
Š
45. Show that the zone axes 11 1
½
Š and 1 21
½ Š are parallel to the plane:
(a) 1 23
ð
Þ
(b) (213)
(c) (312)
(d) (123)
46. The zone axis lying at the intersection of the two planes 21 3
ð
Þ and (110) is:
(a) 3 31
½
Š
(b) 3 11
½
Š
(c) 21 1
½
Š
(d) 21 3
½
Š
47. The (hkl) plane containing the two directions [131] and 0 11
½
Š is:
(a) 1 31
ð
Þ
(b) 4 1 1
ð
Þ
(c) 3
14
ð
Þ
(d) 1 43
ð
Þ
176
4 Unit Cell Representations of Miller Indices