Given,
u=−15‌cm,f‌=20‌cm
‌

1

f

‌=‌

1

v

−‌

1

u

‌

1

20

‌=‌

1

v

+‌

1

15

‌

1

v

‌=‌

1

20

−‌

1

15

v‌=−60‌cm.
Four characteristics of the image formed by the lens are :
(i) Virtual, (ii) Erect, (iii) At a distance of 60 cm on the same side of the lens as the object, (iv) Enlarged or magnified image.