A thin glass (refractive index 1.5) lens has optical power of – 5D in air. Its optical power in a liquid medium is

Q. A thin glass (refractive index $1.5$) lens has optical power of $-5D$ in air. Its optical power in a liquid medium with refractive index $1.6$ will be:

Q. A thin glass lens with relative refractive index ${\mu }_a^g=1.5$ , has an optical power of $-5\text{D}$ in air. Its optical power in a liquid medium with relative refractive index ${\mu }_a^l=1.6$ will be

[Assume, lens is fully immersed in the liquid]