Unity Vuforia Scale and True Dimension

Hi all, I am a newbie in Vuforia. I am currently developing a software that needs to utilize the true dimension of the AR marker.I am using the Unity extension of Vuforia and  is currently using a 10cmx10cm custom AR marker. width 10cm and height 10cm.I am confused on the scale where vuforia reads and outputs to unity.After a few experimentations, i found out that the scale of the AR marker in Unity world and the distance of camera from the AR marker in Unity world changes the output of the position and posture (in terms of coordinates and rotation you see in the inspector in Unity when selecting the AR camera)I would appreciate it if someone can explain why is this the case and how can i achieve a 1:1 ratio of both of the AR markers in Unity world and real world.I thank you in advance to those willing to share their knowledge and wisdom.