Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25Â cm from the optical centre?

Find the power of a convex lens if the image formed is at a distance o

1.	Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25Â cm from the optical centre?
A.	1 diopters
B.	-9 diopters
C.	9 diopters
D.	-1 diopters
Answer» D. -1 diopters