the difference between enantiomerism and optical isomerism?

Answer 1

Optical isomerism is the phenomenon by which certain compounds rotate the plane of polarised ligth in a characteristic way when it is passes through their solutions.
Enantiomers are stereoisomers that are related to each other as non-superimposable mirror images.Such stereoisomers differ only in the orientation in which they rotate the plane of polarised light.
A mixture of two enantiomers in equal proportions have zero optical activity(racemic mixture)

Answer 2

Optical isomerism refers to the property of chemicals being able to affect the plane of polarised light.
I'm not sure there is exactly a word called enantiomerism, but i do know enantiomers refer to a pair of isomers with same molecular formula (specifically, two!).

Answer 3

Optical isomers rotate plane polarised light in opposite directions.
Enantiomers are those molecules having non-superimposable mirror images.
One usually leads to the other!