JEE Main 2019 — Ray Optics Question with Solution

A concave mirror has radius of curvature of $40\mathrm{ }\mathrm{c}\mathrm{m}.$ It is at the bottom of a glass that has water filled up to $5\mathrm{ }\mathrm{c}\mathrm{m}$ (see figure). If a small particle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance $\mathrm{d}$ from the surface of water. The value of $\mathrm{d}$ is close to: (Refractive index of water $=1.33)$