Question

An object is kept at a distance of 9 cm from a convex lens of focal length 21 cm. Your science teacher
has written the following equation, to calculate the distance (d cm) of the image formed, on the
blackboard. Is the following equation correct? (Use standard sign convention)
1 / (+21)= 1 / (+d) - 1 /(-9)
(A) Yes
(B) No
(C) Can't say​

Answer 1

Answer:

yes it is please mark my answer brainiest