KCET · Physics · Wave Optics
Which of the following as a dichroic crystal?
- A Quartz
- B Tourmaline
- C Mica
- D Selenite
Answer & Solution
Correct Answer
(B) Tourmaline
Step-by-step Solution
Detailed explanation
Some crystals such as tourmaline and sheets of iodosulphate of quinine have the property of strongly absorbing the light with vibrations
\[
r+r^{\prime}+90^{\circ}=180^{\circ}
\]
\[
\begin{array}{ll}
\Rightarrow & \mathrm{r}+\mathrm{r}^{\prime}=90^{\circ} \\
\text { or } & \mathrm{i}+\mathrm{r}^{\prime}=90^{\circ}
\end{array}
\]
perpendicular to a specific direction (called transmission axis) transmitting the light with vibrations parallel to it. This selective absorption of light is called dichroism.
\[
r+r^{\prime}+90^{\circ}=180^{\circ}
\]
\[
\begin{array}{ll}
\Rightarrow & \mathrm{r}+\mathrm{r}^{\prime}=90^{\circ} \\
\text { or } & \mathrm{i}+\mathrm{r}^{\prime}=90^{\circ}
\end{array}
\]
perpendicular to a specific direction (called transmission axis) transmitting the light with vibrations parallel to it. This selective absorption of light is called dichroism.
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