Which of the following axis system is being satisfied by monoclinic crystal system?

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RRB Paper · Accepted Answer

There are four crystal systems whose axes are not all at right angles: hexagonal, trigonal, monoclinic, and triclinic. Monoclinic crystals have three unequal unit cell axes, but one of the unit cell axes is at right angles to the other two, and there is a twofold rotation axis parallel to b. The monoclinic system has three unequal edges, two angles of 90°, and one different angle. In a monoclinic system, the crystal is described by vectors of unequal lengths a ≠ b ≠ c, α = β = 90o ≠ ϒ

Which of the following axis system is being satisfied by monoclinic crystal system?

a = b = c

? = ? = 90° ? ?

a ? b = c

? = ? = ? = 90°

a ? b ? c

? = ? = 90° ? ?

a = b = c

? ? ? = ? = 90°

The correct answer is `No. 3: a ? b = c`

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Which of the following axis system is being satisfied by monoclinic crystal system?

a = b = c

? = ? = 90° ? ?

a ? b = c

? = ? = ? = 90°

a ? b ? c

? = ? = 90° ? ?

a = b = c

? ? ? = ? = 90°

The correct answer is No. 3: a ? b = c

The correct answer is `No. 3: a ? b = c`