Times, Sunday Times (2010) His caustic comments make wonderful copy, of course. Times, Sunday Times (2009) But over ten years, audiences have become less able to accept her caustic humour. The Sun (2010) Doctors feared she would die from horrific injuries caused by the 98 per cent strength caustic soda.
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
Parallax adjusts the target to the reticle (crosshair). The target image and the reticle must be on the same focal plane within the scope or there is room for apparent movement of the reticle on the target when the shooter'e eye moves (or is positioned differently at the scope).