26. fora crystal a = 0.82 nm, b = 0.94 nm, c = 0.75 nm, d123 = 0.21 nm then d a99 0.21 (a) nm 3 (b) 0.21 x 3 nm (c) 0.063 nm (d) none of these

plzzz solve anyone 26. Fora crystal a = 0.82 nm, b = 0.94 nm, c = 0.75 nm, d123 = 0.21 nm then d 399 0.21 (a) nm 3 (b) 0.21 x 3 nm (c) 0.063 nm (d) None of these