3. What are Bravais lattices and crystal system? Explain why the basc centred tetragonal, the face centred tetragonal and the face centred rhombohedral have not becn included in the Fig. 1.24. Orthorhombic-P Orthorhombic-C Tetragonal-P Orthorhombic-I Orthorhombic-F Tetragonal-I Нехаgonal-P Trigonal-R Cubic-P Cubic-I Cubic-F Fig. 1.24 The fourteen Bravais or space lattices

3. What are Bravais lattices and crystal system? Explain why the basc centred tetragonal, the face centred tetragonal and the face centred rhombohedral have not becn included in the Fig. 1.24. Orthorhombic-P Orthorhombic-C Tetragonal-P Orthorhombic-I Orthorhombic-F Tetragonal-I Нехаgonal-P Trigonal-R Cubic-P Cubic-I Cubic-F Fig. 1.24 The fourteen Bravais or space lattices