Radius of curvature of an equi – convex lens of glass ( ) is . Find its focal length. An object of…

Radius of curvature of an equi – convex lens of glass ($n = 1\cdot5$) is $30\text{ cm}$. Find its focal length. An object of height $5\cdot0\text{ cm}$ is placed at a distance of $60\text{ cm}$ from the optical centre of the lens. Find the position and the height of the image formed.