Question

For orthorhombic system axial ratios are $a \ne b \ne c$ and the axial angles are

• A. $\alpha = \beta = \gamma \ne 90^\circ$
• B. $\alpha = \beta = \gamma = 90^\circ$
• C. $\alpha = \gamma = 90^\circ, \beta \ne 90^\circ$
• D. $\alpha \ne \beta \ne \gamma \ne 90^\circ$

Answer 1

Answer: (B)

Orthorhombic crystal has three unequal axis
which are at right angle to each other $a \ne b \ne c,$ all
angles = $90^\circ $
So, axial distances $a \ne b \ne c,$ and axial angles
a = p = y = $90^\circ $