Physics - Geometrical Optics Question with Solution | TestHub

A biconvex thin lens is prepared from glass $(\mu =1.5)$, the two bounding surfaces having equal radii of 25 cm each. One of the surfaces is silvered from outside to make it reflecting. An object is placed before this lens at distance $\ell \mathrm{cm}$ so that the image is formed on the object itself. The value of $\frac{2\ell }{5}$ is: [Lens is placed in air $(\mu =1)$ ]