A ray of light incidents at an angle of $9.3^{\circ}$ on one face of a small angle prism of refracting angle $6^{\circ}$. If the ray of light emerges normally from the second face, the refractive index of the material of the prism is

• A

  $1.40$
• B

  $1.45$
• Correct answer
  C

  $1.55$
• D

  $1.50$

Hence, the correct answer is option: 'C'.