The crystals are bonded by plane faces `(f)` straight edges `(e)` and interfacial angle `(c)`. The relationship between these is `:`

The crystals are bounded by plane faces (f), straight edges (e) and interfacial angle (c). The relationship between these is :

What is the relationship between e.m.f. and magnetic flux?

The statement that, .. That crystals of same substance can have different shapes depending upon the number and size of faces but the angle between the corresponding faces remains constant .. is known as :

Number of crystal systems having, only 2 types of Bravais lattices = x, Number of crystal systems having, at least 2 interfacial angles equal = y, All the three interfacial angles and all the three axes lengths equal = z Then find y -(x +z) .