How would you justify that the relative lowering in vapour pressure is a colligative property ?

Explanation

According to Raoult.s law , " the relative lowering of vapoure pressure `((po-ps)/(po))` is equal to the mole fraction of the solute `(X_1 (n_1)/(n_1 + n_2))`
`implies(po-ps)/(po)=X_1`.From the above equation it is clear that relative lowering of vapour pressure depends upon the concentration or number of molecules of solute present in the solution.