Question
An equiconvex lens made of glass with a refractive index of $\frac{3}{2}$ has a focal length of $f$ in air. It is completely immersed in water with a refractive index of $\frac{4}{3}$. The percentage change in the focal length is:
An equiconvex lens made of glass with a refractive index of $\frac{3}{2}$ has a focal length of $f$ in air. It is completely immersed in water with a refractive index of $\frac{4}{3}$. The percentage change in the focal length is: