`u=-27cm, R = -36cm, f=-18cm`
`(1)/(u)+(1)/(upsilon)=(1)/(f)rArr(-1)/(27)+(1)/(v)=(-1)/(18)`
`(1)/(v)=(1)/(27)-(1)/(18) rArr (1)/(v)=(-1)/(54)`
`v=-54cm.`
The Screen should be placed 54 cm from the mirror
`m=(1)/(O)=(-v)/(u) rArr (I)/(2.5)=(-54)/(27)`
`U=-5cm`
`therefore` The image is real, inverted and magnified. If the candle is moved closer, the screen would have moved farther and farther. Closer than 18 cm from the mirror, the image gets virutal and cannot be collected on the screen.