An object is placed at a distance of 12cm from a convex lens of focal length 8cm. Find nature of the image.
Focal length of convex lens, f=8 cm
Object distance, u=−12 cm
Using lens formula 1v−1u=1f
where v is the image distance.
∴ 1v−1−12=18
⟹ v=+24 cm
(+ve sign indicates that image is formed behind the lens)
Hence the image formed is real and inverted.