Creating an educational simulation to show how sizes of shadow changes when user adjusts slider

Hi everyone, I'm trying to create a simulation to show how the height of a shadow changes when a user adjusts the distance between object and light source.

I have written in to articulate support for assistance and they have advised to change the states when slider is being adjusted. While the size of shadow can be change based on the states, the corresponding arrows representing the light rays from the torch light is different to change.

I'm writing to see if the community here has any similar experience creating such simulation and can provide help?

Please see Slide 2.1 for the scenario mentioned. Appreciate if  anyone here could help! :)