Question

a small candle 2.5 CM in size is placed 27 CM in front of a concave mirror of radius of curvature 30 centimetre at what distance from the mirror should ask in the place in order to receive ASAP image

Answer 1

ho=2.5
u=-27
r=-30
r=2f
f=-15
1/v+1/u=1/f
1/v=1/f-1/u
1/v=1/-30-1/-27
1/v=9-10/270
1/v=-1/270
v=-270