Size of the object [o] = +7cm
F = -18cm
V = ?
1/f = 1/v+1/u
1/-18cm = 1/v-1/27
v = -54cm
Since Vis – ve screen should be placed at 54cm in front of the mirror.
Size of the image : m= I/O= -v/u
Nature of the image : image is real , inverted and magnified.