When white light passes through the achromatic combination of prisms, then what is observed?

What wii be the ratio of the angle of minimum deviation of a prism when it is dipped in water and when it is in air ? Given refractive index of glass with respect to air is  ${}_a{\mu }_g=\frac{3}{2}$and refractive index of water with respect to air is${}^a\mu _w=\frac{4}{3}$. Assuming prism angle is very small.