Problem 4 – Hint 1

The first step towards the solution is understanding that the given three point images are insufficient to determine neither the position of the lens nor its focal length.

Please submit the solution to this problem via e-mail to physcs.cup@gmail.com. The next hint for the Problem 4 will be published at 13:00 GMT, 13th March 2022, together with the next updates of the intermediate results.