u = – 27 cm
f = – 18 cm
h0 = 7.0 cm
We need to find out size and nature of image
We know the mirror formula that
1/v = 1/f- 1/u
1/v = -1/18 + 1/27 = -1/54
V = – 54 cm
The screen must be placed at a distance of 54 cm from the mirror in front of it.
hi/7 = +54/-27 hi= -2 x 7 = -14 cm.
Thus, the image is of 14 cm length and is inverted image