An object of height $2.5\mathrm{cm}$ is placed at a distance of $15\mathrm{cm}$ from the optical centre 'O' of a convex lens of focal length $10\mathrm{cm}$. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O', principal focus $\mathit{F}$ and height of the image on the diagram.