What is the position of image when an object is placed is at a distance of 10 cm from a convex lens of focal length 10 cm?

An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find : nature of the image

An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find : the position of the image

An object is placed 20 cm from a convex lens of focal length 10 cm. The image must be-

An object of height 2 cm is placed at a distance of 15 cm from a convex lens of focal length 12 cm. Find the position and size of the image.