Discussion
Solid angle is an angle between at least :
Answer: D
A solid angle is formed between at least Three facies, that is, three crystal faces.
In crystallography a solid angle is the corner where crystal faces meet at a point. Two faces meet only along an edge, forming an interfacial (dihedral) angle; it takes at least three faces meeting at a point to enclose a solid angle, as at the corner of a cube.
Lines bound plane angles, not solid angles, so the options in terms of lines are wrong, and two faces give an edge, not a solid angle.
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