If displaystyle v-ordinary- - v-extraordinary- the crystal is said to bepositivenegativeneutralbirefringent

Question

Toppr Admin · Accepted Answer

As there are two types of velocities then the crystal is Birefringent and as Vordinary-gt-Vextraordinary it is positive-xA0-option A and D are correct-xA0-

If $v_{o r d i n a r y} > v_{e x t r a o r d i n a r y}$ the crystal is said to be
positive
negative
neutral
birefringent

As there are two types of velocities then the crystal is $B i r e f r i n g e n t$ and as $V_{o r d i n a r y} > V_{e x t r a o r d i n a r y}$ it is $p o s i t i v e$
option $A$ and $D$ are correct

If vordinary>vextraordinary the crystal is said to bepositivenegativeneutralbirefringent

As there are two types of velocities then the crystal is Birefringent and as Vordinary>Vextraordinary it is positive option A and D are correct

If $v_{o r d i n a r y} > v_{e x t r a o r d i n a r y}$ the crystal is said to be
positive
negative
neutral
birefringent

As there are two types of velocities then the crystal is $B i r e f r i n g e n t$ and as $V_{o r d i n a r y} > V_{e x t r a o r d i n a r y}$ it is $p o s i t i v e$
option $A$ and $D$ are correct