Beam converges to point P. Lens placed 15 cm from P. Convex lens f=20 cm. Where does light converge now?

The convergent beam acts as a virtual object: u=+15 cm (positive). 1/v = 1/f + 1/u = 1/20 + 1/15 = (3+4)/60=7/60 → v=8.57 cm (real image beyond lens).…