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The rain sensor is at the top of the windscreen above the rear view mirror. This is at the bottom of the screen, the dash board and wiper is a give away
As already stated, it's for devices like toll passes but also works well as a portal for a RDS-TMC antenna on a sat-nav as the coating on the screen attenuates the signal.
As above it's just a part of the windscreen that doesn't have the coating. I assume France is the same as here in Australia where charges for toll roads are done electronically through a tag. The screen coating blocks the signal.
Sensor for lights and rain is otherside of the piece above mirror. If you look on outside at top of winscreen...its there. With engine on, cover it with your hand...