The intermediate image P' is a real image for L 1 obtained as the intersection of rays 2 and 3 passing through the object and image focal points F 1o and F 1i of lens L 1 . P' is now a virtual object ...The intermediate image P' is a real image for L 1 obtained as the intersection of rays 2 and 3 passing through the object and image focal points F 1o and F 1i of lens L 1 . P' is now a virtual object point for lens L 2 . To find its image by L 2 , draw ray 4 from P' through the centre of lens L 2 back to S (this ray is refracted by lens L 1 but not by L 2 ) and draw ray 3 as refracted by lens L 2 . Since ray 3 is parallel to the optical axis between the lenses, it passes through the back focal …
