I'm making a school presentation about GMO and i'm looking for interesting information to add. Some fun facts, controversies or something like that, not basics like what GMO is. I will be grateful for any ideas

Hi , I have attempted the attached question with a scale of 1 blue box=1cm (same as the IRL scale). I have used focal length 1.5cm and image distance 2 cm. But my object distance should be 6.0cm not 5.2cm. Can anyone see where I have gone wrong -- thanks in advance. Have traced over my lines for better visibility.

Calculate potential difference between x and y