u = – 27 cm, R = – 36 cm,
f = -R/2 = -36/2 = - 18cm.
Height of object, h = 2.5 cm, v = ?
1/v + 1/u = 1/f
As,
1/v = 1/f - 1/u = 1/-18 - 1/(-27) = -1/18 + 1/27 = (-3 + 2)/54 = -1/54 = - 54cm
The screen should be placed at 54 cm from the mirror on the same side as the object.
m = h'/h = - v/u
magnification,
or, h' = - v/u x h = -((-54)/(-27)) x 2.5 = - 2 x 2.5 = - 5cm.
The image is real and inverted. If the candle is moved closer to the mirror, the screen has to be moved away from the mirror.