Physics - Geometrical Optics Question with Solution | TestHub

The distance between an object and a screen is$100 \mathrm{cm}$. A lens can produce real image of the object on the screen for two different positions between the screen and the object. The distance between these two positions is$40 \mathrm{cm}$. If the power of the lens is close to$\left(\frac{\mathrm{N}}{100}\right)\mathrm{D}$where$\mathrm{N}$is an integer, the value of$\mathrm{N}$is _________