In its section "Prisms" you provide the multiple beam light source. It would be great if you could enlarge the distance between the beams to show that beams more distant from the optical axis are refracted stronger when focused by a lens – to discuss the validity of the lens equation 1/f = 1/o + 1/i. Would also be good to provide a thin lens. But anyway, it's great.
oliver-phet
commented
7 years ago