A thin converging lens of focal length 20 cm is located at the origin and its axis lies on the x axis. A point source of red light is placed at location −25, 1, 0 cm. Where is the location of the...

A thin converging lens of focal length 20 cm is located at the origin and its axis lies on the x axis. A point source of red

light is placed at location −25, 1, 0 cm. Where is the location of the image of the source? Is it a real or a virtual image?

It helps to draw a diagram and trace the “easy” rays.