Angle of deviation $\left(\mathrm{\delta }\right)$ by a prism (refractive index = $\mathrm{\mu }$ and supposing the angle of prism A to be small) can be given by

• A

  $\mathrm{\delta }=(\mathrm{\mu }-1)\mathrm{A}$

• B

  $\mathrm{\delta }=(\mathrm{\mu }+1)\mathrm{A}$

• C

  $\mathrm{\delta }=\frac{\sin \frac{\mathrm{A}+\mathrm{\delta }}{2}}{\sin \frac{\mathrm{A}}{2}}$

• D

  $\mathrm{\delta }=\frac{\mathrm{\mu }-1}{\mathrm{\mu }+1}\mathrm{A}$