To see his own complete image, a man of height $\mathbf{h}$ would require a mirror of length at least equal to half his height, i.e., $=\mathrm{h} / \mathbf{2}$
. This is because light rays from the top and bottom of a person reflect off the mirror at equal angles. So, a mirror half the person's height will suffice to see the full reflection. However, the mirror must be positioned appropriately, with its top and bottom aligned with the person's height. Please note that this is a simplified explanation and actual results may vary depending on the observer's distance from the mirror and the angle of observation.