Question

an object 1 cm high is placed at a distance of 18 cm from a concave mirror of focal length 12 cm calculate the position size and nature of the image

Answer 1

f=-12cm and u=-18cm  & ho=1cm
1/f=1/v+1/u
-1/12+1/18=1/v
1/v=-1/36
v=-36cm
hi/ho=v/u
hi=(36/18)*1
hi=2cm
Therefore the image is real and highlyenlarged