Hi,

If a compound that has a chiral carbon but consists of a plane of symmetry or centre of symmetry, then it is known as a meso compound.

Dextro-rotatory compound: The compounds which rotate the plane of polarized light to the right or clockwise, then it is said to be dextro-rotatory.
Laevo-rotatory compound: The compound which rotates the plane of polarized light to the left or anticlockwise, then it is said to be laevo-rotatory.

Thanks for asking 

Good day :)