How to use \graphicspath?

\graphicspath{{D:/LATEX/Reports@IIT/figures/}}

Try it!

More general case:

\graphicspath{{subdir1/}{subdir2/}{subdir3/}...{subdirn/}}

The ... is not the part of the syntax for sure! It is there just to represent something like 1,2,3,...,n in a set theory.

If the figures are saved in a sibling directory, use ../ to access the parent directory.

    \graphicspath{{../figs/}}

Every specific path shoud be ended by /, and contained by a pair of braces. Try:

\graphicspath{{D:/LATEX/Reports@IIT/figures/}}