Orthographic camera question?

1st question is. Is the size of orthographic camera measured in meter? If yes can I make my camera adaptive to any monitor by using **



no. it’s measured in units.
you do not need to set orthographic size, it will be fit to the size.

for example if you set orth. size to 5, then your scene of view would be 10 units high. any screen would be showing this scene of 10 units, only width will differ, due to aspect ratio.