A small \( \operatorname{rod} A B C \) is put in water making an an...

A small \( \operatorname{rod} A B C \) is put in water making an angle \( 6^{\circ} \) with vertical. If it is viewed paraxially from above, it will look like bent shaped \( A B C^{\prime} \). The angle of bending \( \left(\angle C B C^{\prime}\right) \) will be in degree is \( \left(n_{w}=\frac{4}{3}\right) \).
Figure \( 5.346 \)
(A) \( 2^{\circ} \)
(B) \( 3^{\circ} \)
(C) \( 4^{\circ} \)
(D) \( 4.5^{\circ} \)