Physics - Geometrical Optics Question with Solution | TestHub

Reflection at concave mirror $\mathrm{v}=\frac{\mathrm{uf}}{\mathrm{u}-\mathrm{f}}=\frac{(-20)(-15)}{-20+15}=-60\mathrm{cm}$ $\mathrm{m}=\frac{{\mathrm{h}}_{\mathrm{I}}}{{\mathrm{h}}_0}=-\frac{\mathrm{v}}{\mathrm{u}}\Rightarrow {\mathrm{h}}_{\mathrm{I}}=-{\mathrm{h}}_0\times \left(\frac{\mathrm{v}}{\mathrm{u}}\right)\Rightarrow {\mathrm{h}}_{\mathrm{I}}=-2\times \left(\frac{-60}{-20}\right)=-6\mathrm{mm}$ Again reflection at convex mirorr $\mathrm{v}=\frac{\mathrm{uf}}{\mathrm{u}-\mathrm{f}}=\frac{10\times 20}{10-20}=-20\mathrm{cm};{\mathrm{h}}_{\mathrm{I}}=-{\mathrm{h}}_0\times \frac{\mathrm{v}}{\mathrm{u}}=-(-8)\times \left(\frac{-20}{10}\right)=-16\mathrm{mm}$