 Pairs of enantiomers are often designated as "right-", "left-handed" or, if they have no bias, "achiral".As polarized light passes through a chiral molecule, the plane of polarization, when viewed along the axis toward the source, will be rotated clockwise (to the right) or anticlockwise (to the left).A right handed rotation is dextrorotary (d); that to the left is levorotary (l).