The refractive index of a prism is 1.6. When prism is immersed in a liquid of 1.2 refractive index, then the change in the angle of minimum deviation…

The refractive index of a prism is 1.6. When prism is immersed in a liquid of $\displaystyle 1.2$ refractive index, then the change in the angle of minimum deviation will be \_\_\_\_. (Assume prism is equilateral) Given $\displaystyle \sin ^{-1}\left(\frac{4}{5}\right)=53^{\circ}$ $$\sin ^{-1}\left(\frac{2}{3}\right)=41^{\circ} $$