If an object is placed 20 cm in front of a half thin convex lens of focal length 10 cm, as shown in figure, then co-ordinate of image taking object position as origin

[20 cm, 0.2 cm] [40 cm, 0.4 cm] [40 cm, −0.2 cm] [20 cm, 0.4 cm]

[20 cm, 0.2 cm]

$\frac{1}{\mathrm{~V}}-\frac{1}{-20}=\frac{1}{10}$ V = 20 m = −1 Co-ordinate is (20 cm, 0.2 cm).