A man of height $1.8 \mathrm{~m}$ stands infront of a large vertical plane mirror. The distance of the image from the man if he stands at a distance of $1.5 \mathrm{~m}$ from the mirror is :
(a) $1 \mathrm{~m}$
(b) $2 \mathrm{~m}$
(c) $3 \mathrm{~m}$
(d) $4 \mathrm{~m}$