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Sajan sarthak Best Answer
(111) as all the plane cut all the axis at unit distance so 1a,1b,1c ... reciprocal of Weiss parameters are Miller indices (1/1, 1/1 ,1/1) = 111
an octahedron is a polyhedron with eight faces, twelve edges, and six vertices. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. A regular octahedron is the dual polyhedron of a cube.