underground pipe for electrical conduit

[Salam123]

 

Hello

I want to put in electrical conduit in the pink marked line before concreter puts the floor in. I want to use this conduit to run a cable across to run RGB colourful lights at the other end of garden.

can any one suggest conduit size and how to make it a u bend and give it to concreter before he pored exposed aggregate pathways??

what size of cable shall I ask him to run across the conduit?