What is the importance of light in our daily lives?

A short sighted person uses a spectacle of power $-0.4 \mathrm{D}$ to see very distant objects. How far can he see without using spectacle?

The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is

Distance between the object and the lens $\left(\mathrm{m}\right)$