A real image is obtained at 30 cm from a convex lens of focal length 7.5 cm. Find the distance of the object from the lens.

A real image is obtained at 30 cm from a convex lens of focal length 7

1.	A real image is obtained at 30 cm from a convex lens of focal length 7.5 cm. Find the distance of the object from the lens.
Answer» Correct answer is: u = -10 cm