The capacity of the first jar = 1L= 1000 ml
The capacity of the second jar = 2L = 2000 ml
Both jars are half filled
Thus the quantity of water in the first jar = 500ml
The quantity of water in the second jar = 1000 ml
Thus, the total quantity of water filled in two jars = 1000ml +500ml= 1500ml = 1.5 L.