Physics - Geometrical Optics Question with Solution | TestHub

When an object is kept at a distance of$30 \mathrm{cm}$from a concave mirror, the image is formed at a distance of$10 \mathrm{cm}$from the mirror. If the object is moved with a speed of$9 \mathrm{cm} {\mathrm{s}}^{-1}$, the speed (in$\mathrm{cm} {\mathrm{s}}^{-1}$) with which image moves at that instant is